--- a/testing/web-platform/meta/css/css-backgrounds/background-clip-color-repaint.html.ini
+++ b/testing/web-platform/meta/css/css-backgrounds/background-clip-color-repaint.html.ini
@@ -1,4 +1,3 @@
 [background-clip-color-repaint.html]
   expected:
-    if (os == "linux"): FAIL
-
+    if (os == "linux") and not webrender: FAIL

--- a/testing/web-platform/meta/css/css-backgrounds/background-clip-color.html.ini
+++ b/testing/web-platform/meta/css/css-backgrounds/background-clip-color.html.ini
@@ -1,4 +1,3 @@
 [background-clip-color.html]
   expected:
-    if (os == "linux"): FAIL
-
+    if (os == "linux") and not webrender: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-025.html.ini
@@ -0,0 +1,3 @@
+[background-size-025.html]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/css/css-backgrounds/background-size-027.html.ini
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-027.html.ini
@@ -1,2 +1,4 @@
 [background-size-027.html]
   prefs: [dom.webcomponents.shadowdom.enabled:true]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-028.html.ini
@@ -0,0 +1,3 @@
+[background-size-028.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-029.html.ini
@@ -0,0 +1,3 @@
+[background-size-029.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-030.html.ini
@@ -0,0 +1,3 @@
+[background-size-030.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size-031.html.ini
@@ -0,0 +1,3 @@
+[background-size-031.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size/vector/wide--cover--nonpercent-width-nonpercent-height-viewbox.html.ini
@@ -0,0 +1,3 @@
+[wide--cover--nonpercent-width-nonpercent-height-viewbox.html]
+  expected:
+    if webrender: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-backgrounds/background-size/vector/wide--cover--nonpercent-width-nonpercent-height.html.ini
@@ -0,0 +1,3 @@
+[wide--cover--nonpercent-width-nonpercent-height.html]
+  expected:
+    if webrender: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-images/gradient-move-stops.html.ini
@@ -0,0 +1,3 @@
+[gradient-move-stops.html]
+  expected:
+    if webrender: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-transforms/transform3d-matrix3d-005.html.ini
@@ -0,0 +1,3 @@
+[transform3d-matrix3d-005.html]
+  expected:
+    if webrender: FAIL

--- a/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001c.html.ini
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001c.html.ini
@@ -1,4 +1,4 @@
 [object-fit-contain-png-001c.html]
-  expected:
-    if webrender: PASS
-    FAIL
+  disabled:
+    if webrender: bug 1425588
+  expected: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001e.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-001e.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001i.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-001i.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001o.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-001o.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-001p.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-001p.html]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002c.html.ini
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002c.html.ini
@@ -1,2 +1,4 @@
 [object-fit-contain-png-002c.html]
+  disabled:
+    if webrender: bug 1425588
   expected: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002e.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-002e.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002i.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-002i.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002o.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-002o.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-contain-png-002p.html.ini
@@ -0,0 +1,3 @@
+[object-fit-contain-png-002p.html]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001c.html.ini
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001c.html.ini
@@ -1,4 +1,4 @@
 [object-fit-scale-down-png-001c.html]
-  expected:
-    if webrender and not debug: PASS
-    FAIL
+  disabled:
+    if webrender: bug 1425588
+  expected: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001e.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-001e.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001i.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-001i.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001o.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-001o.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-001p.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-001p.html]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002c.html.ini
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002c.html.ini
@@ -1,2 +1,4 @@
 [object-fit-scale-down-png-002c.html]
+  disabled:
+    if webrender: bug 1425588
   expected: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002e.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-002e.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002i.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-002i.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002o.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-002o.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/vendor-imports/mozilla/mozilla-central-reftests/images3/object-fit-scale-down-png-002p.html.ini
@@ -0,0 +1,3 @@
+[object-fit-scale-down-png-002p.html]
+  disabled:
+    if webrender: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-height.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-height.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerheight.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-innerheight.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-innerwidth.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-innerwidth.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-left.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-left.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screenx.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-screenx.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-screeny.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-screeny.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-top.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-top.html]
+  disabled:
+    if webrender and not debug: bug 1425588

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-non-integer-width.html.ini
@@ -0,0 +1,3 @@
+[open-features-non-integer-width.html]
+  disabled:
+    if webrender and not debug: bug 1425588

--- a/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-innerheight-innerwidth.html.ini
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-innerheight-innerwidth.html.ini
@@ -1,7 +1,10 @@
 [open-features-tokenization-innerheight-innerwidth.html]
+  disabled:
+    if webrender and not debug: bug 1425588
+
   ["innerwidth==401" should set width of opened window]
     expected: FAIL
 
   ["innerheight==402" should set height of opened window]
     expected: FAIL
 

--- a/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-screenx-screeny.html.ini
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-screenx-screeny.html.ini
@@ -1,7 +1,10 @@
 [open-features-tokenization-screenx-screeny.html]
+  disabled:
+    if webrender and not debug: bug 1425588
+
   ["screenx==141" should set left position of opened window]
     expected: FAIL
 
   ["screeny==142" should set top position of opened window]
     expected: FAIL
 

--- a/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-top-left.html.ini
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-top-left.html.ini
@@ -1,9 +1,12 @@
 [open-features-tokenization-top-left.html]
+  disabled:
+    if webrender and not debug: bug 1425588
+
   ["left==141" should set left position of opened window]
     expected: FAIL
 
   ["top==142" should set top position of opened window]
     expected: FAIL
 
   ["top=152==left=152" should set top and left position of opened window]
     expected: FAIL

--- a/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-width-height.html.ini
+++ b/testing/web-platform/meta/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-width-height.html.ini
@@ -1,9 +1,12 @@
 [open-features-tokenization-width-height.html]
+  disabled:
+    if webrender and not debug: bug 1425588
+
   ["width==401" should set width of opened window]
     expected: FAIL
 
   ["height==402" should set height of opened window]
     expected: FAIL
 
   ["height==402 width = 401" should set height and width of opened window]
     expected: FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/html/browsers/the-window-object/window-open-noopener.html.ini
@@ -0,0 +1,3 @@
+[window-open-noopener.html]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/svg/shapes/rect-03.svg.ini
+++ b/testing/web-platform/meta/svg/shapes/rect-03.svg.ini
@@ -1,5 +1,5 @@
 [rect-03.svg]
   expected:
-    if (os == "linux"): PASS
+    if (os == "linux") and not webrender: PASS
     if (os == "mac"): PASS
     FAIL

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/webdriver/tests/actions/mouse_dblclick.py.ini
@@ -0,0 +1,3 @@
+[mouse_dblclick.py]
+  disabled:
+    if webrender: bug 1425588

--- a/testing/web-platform/meta/webdriver/tests/element_retrieval/get_active_element.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/element_retrieval/get_active_element.py.ini
@@ -1,7 +1,10 @@
 [get_active_element.py]
+  disabled:
+    if webrender: bug 1425588
+
   [test_handle_prompt_dismiss]
     expected: FAIL
 
   [test_handle_prompt_accept]
     expected: FAIL
 

--- a/testing/web-platform/meta/webdriver/tests/execute_async_script/user_prompts.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/execute_async_script/user_prompts.py.ini
@@ -1,9 +1,12 @@
 [user_prompts.py]
+  disabled:
+    if webrender: bug 1425588
+
   [test_handle_prompt_accept]
     expected: FAIL
 
   [test_handle_prompt_dismiss]
     expected: FAIL
 
   [test_handle_prompt_dismiss_and_notify]
     expected: FAIL

--- a/testing/web-platform/meta/webdriver/tests/execute_script/user_prompts.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/execute_script/user_prompts.py.ini
@@ -1,9 +1,12 @@
 [user_prompts.py]
+  disabled:
+    if webrender: bug 1425588
+
   [test_handle_prompt_accept]
     expected: FAIL
 
   [test_handle_prompt_dismiss]
     expected: FAIL
 
   [test_handle_prompt_dismiss_and_notify]
     expected: FAIL

--- a/testing/web-platform/meta/webdriver/tests/navigation/get_title.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/navigation/get_title.py.ini
@@ -1,7 +1,10 @@
 [get_title.py]
+  disabled:
+    if webrender: bug 1425588
+
   [test_title_handle_prompt_dismiss]
     expected: FAIL
 
   [test_title_handle_prompt_accept]
     expected: FAIL
 

--- a/testing/web-platform/meta/webdriver/tests/sessions/new_session/create_alwaysMatch.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/sessions/new_session/create_alwaysMatch.py.ini
@@ -1,4 +1,7 @@
 [create_alwaysMatch.py]
+  expected:
+    if webrender: TIMEOUT
+
   [test_valid[timeouts-value10\]]
     expected: FAIL
 

--- a/testing/web-platform/meta/webdriver/tests/sessions/new_session/create_firstMatch.py.ini
+++ b/testing/web-platform/meta/webdriver/tests/sessions/new_session/create_firstMatch.py.ini
@@ -1,4 +1,7 @@
 [create_firstMatch.py]
+  expected:
+    if webrender: TIMEOUT
+
   [test_valid[timeouts-value10\]]
     expected: FAIL
 

--- a/testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -125,18 +125,18 @@ def env_options():
 
 
 def run_info_extras(**kwargs):
     return {"e10s": kwargs["gecko_e10s"],
             "headless": "MOZ_HEADLESS" in os.environ}
 
 
 def update_properties():
-    return (["debug", "stylo", "e10s", "os", "version", "processor", "bits"],
-            {"debug", "e10s", "stylo"})
+    return (["debug", "stylo", "webrender", "e10s", "os", "version", "processor", "bits"],
+            {"debug", "e10s", "stylo", "webrender"})
 
 
 class FirefoxBrowser(Browser):
     used_ports = set()
     init_timeout = 60
     shutdown_timeout = 60
 
     def __init__(self, logger, binary, prefs_root, test_type, extra_prefs=None, debug_info=None,