--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -150,16 +150,17 @@ skip-if = e10s # Bug 1101993 - times out
 [browser_autocomplete_autoselect.js]
 [browser_autocomplete_oldschool_wrap.js]
 [browser_autocomplete_tag_star_visibility.js]
 [browser_backButtonFitts.js]
 skip-if = os == "mac" # The Fitt's Law back button is not supported on OS X
 [browser_beforeunload_duplicate_dialogs.js]
 [browser_blob-channelname.js]
 [browser_bookmark_popup.js]
+skip-if = (os == "linux" && debug) # mouseover not reliable on linux debug builds
 [browser_bookmark_titles.js]
 skip-if = buildapp == 'mulet' || toolkit == "windows" # Disabled on Windows due to frequent failures (bugs 825739, 841341)
 [browser_bug304198.js]
 [browser_bug321000.js]
 skip-if = true # browser_bug321000.js is disabled because newline handling is shaky (bug 592528)
 [browser_bug329212.js]
 skip-if = e10s # Bug 1236991 - Update or remove tests that use fillInPageTooltip
 [browser_bug331772_xul_tooltiptext_in_html.js]