--- a/browser/themes/linux/jar.mn
+++ b/browser/themes/linux/jar.mn
@@ -64,21 +64,17 @@ browser.jar:
 * skin/classic/browser/preferences/in-content/dialog.css      (preferences/in-content/dialog.css)
 * skin/classic/browser/preferences/in-content-new/dialog.css          (preferences/in-content-new/dialog.css)
   skin/classic/browser/preferences/applications.css   (preferences/applications.css)
   skin/classic/browser/social/services-16.png         (social/services-16.png)
   skin/classic/browser/social/services-64.png         (social/services-64.png)
   skin/classic/browser/tabbrowser/tabDragIndicator.png      (tabbrowser/tabDragIndicator.png)
 
   skin/classic/browser/sync-desktopIcon.svg  (../shared/sync-desktopIcon.svg)
-  skin/classic/browser/sync-horizontalbar.png
-  skin/classic/browser/sync-horizontalbar@2x.png
   skin/classic/browser/sync-mobileIcon.svg  (../shared/sync-mobileIcon.svg)
-  skin/classic/browser/syncProgress-horizontalbar.png
-  skin/classic/browser/syncProgress-horizontalbar@2x.png
 #ifdef E10S_TESTING_ONLY
   skin/classic/browser/e10s-64@2x.png (../shared/e10s-64@2x.png)
 #endif
 
 [extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}] chrome.jar:
 % override chrome://browser/skin/feeds/audioFeedIcon.png              chrome://browser/skin/feeds/feedIcon.png
 % override chrome://browser/skin/feeds/audioFeedIcon16.png            chrome://browser/skin/feeds/feedIcon16.png
 % override chrome://browser/skin/feeds/videoFeedIcon.png              chrome://browser/skin/feeds/feedIcon.png

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Hc$@<O00001

--- a/browser/themes/osx/jar.mn
+++ b/browser/themes/osx/jar.mn
@@ -97,31 +97,25 @@ browser.jar:
   skin/classic/browser/preferences/applications.css         (preferences/applications.css)
   skin/classic/browser/social/services-16.png               (social/services-16.png)
   skin/classic/browser/social/services-16@2x.png            (social/services-16@2x.png)
   skin/classic/browser/social/services-64.png               (social/services-64.png)
   skin/classic/browser/social/services-64@2x.png            (social/services-64@2x.png)
   skin/classic/browser/tabbrowser/tabDragIndicator.png                   (tabbrowser/tabDragIndicator.png)
   skin/classic/browser/tabbrowser/tabDragIndicator@2x.png                (tabbrowser/tabDragIndicator@2x.png)
   skin/classic/browser/sync-desktopIcon.svg  (../shared/sync-desktopIcon.svg)
-  skin/classic/browser/sync-horizontalbar.png
-  skin/classic/browser/sync-horizontalbar@2x.png
   skin/classic/browser/sync-mobileIcon.svg  (../shared/sync-mobileIcon.svg)
-  skin/classic/browser/syncProgress-horizontalbar.png
-  skin/classic/browser/syncProgress-horizontalbar@2x.png
   skin/classic/browser/yosemite/menuPanel-customize.png                (menuPanel-customize-yosemite.png)
   skin/classic/browser/yosemite/menuPanel-customize@2x.png             (menuPanel-customize-yosemite@2x.png)
   skin/classic/browser/yosemite/menuPanel-exit.png                     (menuPanel-exit-yosemite.png)
   skin/classic/browser/yosemite/menuPanel-exit@2x.png                  (menuPanel-exit-yosemite@2x.png)
   skin/classic/browser/yosemite/menuPanel-help.png                     (menuPanel-help-yosemite.png)
   skin/classic/browser/yosemite/menuPanel-help@2x.png                  (menuPanel-help-yosemite@2x.png)
   skin/classic/browser/yosemite/reload-stop-go.png                     (reload-stop-go-yosemite.png)
   skin/classic/browser/yosemite/reload-stop-go@2x.png                  (reload-stop-go-yosemite@2x.png)
-  skin/classic/browser/yosemite/sync-horizontalbar.png                 (sync-horizontalbar-yosemite.png)
-  skin/classic/browser/yosemite/sync-horizontalbar@2x.png              (sync-horizontalbar-yosemite@2x.png)
 #ifdef E10S_TESTING_ONLY
   skin/classic/browser/e10s-64@2x.png (../shared/e10s-64@2x.png)
 #endif
 
 [extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}] chrome.jar:
 % override chrome://browser/skin/feeds/audioFeedIcon.png                   chrome://browser/skin/feeds/feedIcon.png
 % override chrome://browser/skin/feeds/audioFeedIcon16.png                 chrome://browser/skin/feeds/feedIcon16.png
 % override chrome://browser/skin/feeds/videoFeedIcon.png                   chrome://browser/skin/feeds/feedIcon.png
@@ -129,10 +123,8 @@ browser.jar:
 % override chrome://browser/skin/menuPanel-customize.png                   chrome://browser/skin/yosemite/menuPanel-customize.png                  os=Darwin osversion>=10.10
 % override chrome://browser/skin/menuPanel-customize@2x.png                chrome://browser/skin/yosemite/menuPanel-customize@2x.png               os=Darwin osversion>=10.10
 % override chrome://browser/skin/menuPanel-exit.png                        chrome://browser/skin/yosemite/menuPanel-exit.png                       os=Darwin osversion>=10.10
 % override chrome://browser/skin/menuPanel-exit@2x.png                     chrome://browser/skin/yosemite/menuPanel-exit@2x.png                    os=Darwin osversion>=10.10
 % override chrome://browser/skin/menuPanel-help.png                        chrome://browser/skin/yosemite/menuPanel-help.png                       os=Darwin osversion>=10.10
 % override chrome://browser/skin/menuPanel-help@2x.png                     chrome://browser/skin/yosemite/menuPanel-help@2x.png                    os=Darwin osversion>=10.10
 % override chrome://browser/skin/reload-stop-go.png                        chrome://browser/skin/yosemite/reload-stop-go.png                       os=Darwin osversion>=10.10
 % override chrome://browser/skin/reload-stop-go@2x.png                     chrome://browser/skin/yosemite/reload-stop-go@2x.png                    os=Darwin osversion>=10.10
-% override chrome://browser/skin/sync-horizontalbar.png                    chrome://browser/skin/yosemite/sync-horizontalbar.png               os=Darwin osversion>=10.10
-% override chrome://browser/skin/sync-horizontalbar@2x.png                 chrome://browser/skin/yosemite/sync-horizontalbar@2x.png            os=Darwin osversion>=10.10

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index 741dd2ed44d2aada4c73646180358de098d304d8..0000000000000000000000000000000000000000
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--- a/browser/themes/shared/customizableui/panelUI.inc.css
+++ b/browser/themes/shared/customizableui/panelUI.inc.css
@@ -738,49 +738,43 @@ toolbaritem[cui-areatype="menu-panel"][s
 /* Add the .toolbaritem-combined-buttons class to increase the specificity so as
  * to override the end margin for .toolbaritem-combined-buttons items further down. */
 #appMenu-fxa-container.toolbaritem-combined-buttons:not([fxastatus="signedin"]) {
   margin-inline-end: 0;
 }
 
 #appMenu-fxa-label,
 #appMenu-fxa-icon {
-  -moz-image-region: rect(0, 16px, 16px, 0);
-  list-style-image: url(chrome://browser/skin/sync-horizontalbar.png);
+  -moz-context-properties: fill;
+  fill: currentColor;
+  list-style-image: url(chrome://browser/skin/sync.svg);
 }
 
 #appMenu-fxa-label {
   -moz-box-flex: 1;
 }
 
-#appMenu-fxa-icon[syncstatus="active"] {
-  list-style-image: url(chrome://browser/skin/syncProgress-horizontalbar.png);
+@keyframes syncRotate {
+  to { transform: rotate(360deg); }
+}
+
+#appMenu-fxa-icon[syncstatus="active"] > .toolbarbutton-icon {
+  animation: syncRotate 0.8s linear infinite;
+  fill: #0a84ff;
 }
 
 #appMenu-fxa-status {
   -moz-box-align: center;
 }
 
 #appMenu-fxa-avatar {
   pointer-events: none;
   list-style-image: url(chrome://browser/skin/fxa/default-avatar.svg);
 }
 
-@media (min-resolution: 1.1dppx) {
-  #appMenu-fxa-label,
-  #appMenu-fxa-icon {
-    list-style-image: url(chrome://browser/skin/sync-horizontalbar@2x.png);
-    -moz-image-region: rect(0, 32px, 32px, 0);
-  }
-
-  #appMenu-fxa-icon[syncstatus="active"] {
-    list-style-image: url(chrome://browser/skin/syncProgress-horizontalbar@2x.png);
-  }
-}
-
 /* Handle different UI states. */
 #appMenu-fxa-container[fxastatus="signedin"] > #appMenu-fxa-status > #appMenu-fxa-label > .toolbarbutton-icon,
 #appMenu-fxa-container:not([fxastatus="signedin"]) > toolbarseparator,
 #appMenu-fxa-container:not([fxastatus="signedin"]) > #appMenu-fxa-icon,
 #appMenu-fxa-container:not([fxastatus="signedin"]) > #appMenu-fxa-status > #appMenu-fxa-avatar {
   display: none;
 }
 
@@ -867,21 +861,16 @@ toolbaritem[cui-areatype="menu-panel"][s
 /* descend from #PanelUI-footer to add specificity, or else the
    padding-inline-start will be overridden */
 #PanelUI-footer > .panel-banner-item {
   width: calc(@menuPanelWidth@ + 30px);
   padding-inline-start: 15px;
   border-inline-start-style: none;
 }
 
-#PanelUI-fxa-label,
-#PanelUI-fxa-icon {
-  list-style-image: url(chrome://browser/skin/sync-horizontalbar.png);
-}
-
 #PanelUI-remotetabs {
   --panel-ui-sync-illustration-height: 157.5px;
 }
 
 .PanelUI-remotetabs-instruction-title,
 .PanelUI-remotetabs-instruction-label,
 #PanelUI-remotetabs-mobile-promo {
   /* If you change the margin here, the min-height of the synced tabs panel
@@ -987,20 +976,16 @@ toolbaritem[cui-areatype="menu-panel"][s
 #PanelUI-remotetabs-deck:not([selectedIndex="3"]) > #PanelUI-remotetabs-nodevicespane {
   visibility: collapse;
 }
 
 #PanelUI-remotetabs-main[devices-status="single"] > #PanelUI-remotetabs-buttons {
   display: none;
 }
 
-#PanelUI-fxa-icon[syncstatus="active"] {
-  list-style-image: url(chrome://browser/skin/syncProgress-horizontalbar.png);
-}
-
 #PanelUI-customize {
   list-style-image: url(chrome://browser/skin/menuPanel-customize.png);
 }
 
 #customization-panelHolder #PanelUI-customize {
   list-style-image: url(chrome://browser/skin/customizableui/menuPanel-customizeFinish.png);
 }
 
@@ -1911,25 +1896,16 @@ menuitem[checked="true"].subviewbutton >
     background-image: url(chrome://browser/skin/customizableui/subView-arrow-back-inverted-rtl@2x.png),
                       linear-gradient(rgba(255,255,255,0.3), transparent);
   }
 
   .panel-banner-item[notificationid^=update] {
     list-style-image: url(chrome://branding/content/icon32.png);
   }
 
-  #PanelUI-fxa-label,
-  #PanelUI-fxa-icon {
-    list-style-image: url(chrome://browser/skin/sync-horizontalbar@2x.png);
-  }
-
-  #PanelUI-fxa-icon[syncstatus="active"] {
-    list-style-image: url(chrome://browser/skin/syncProgress-horizontalbar@2x.png);
-  }
-
   #PanelUI-customize {
     list-style-image: url(chrome://browser/skin/menuPanel-customize@2x.png);
   }
 
   #customization-panelHolder #PanelUI-customize {
     list-style-image: url(chrome://browser/skin/customizableui/menuPanel-customizeFinish@2x.png);
   }
 

--- a/browser/themes/windows/jar.mn
+++ b/browser/themes/windows/jar.mn
@@ -32,25 +32,17 @@ browser.jar:
   skin/classic/browser/reload-stop-go.png
   skin/classic/browser/reload-stop-go@2x.png
   skin/classic/browser/reload-stop-go-win7.png
   skin/classic/browser/reload-stop-go-win7@2x.png
   skin/classic/browser/searchbar.css
   skin/classic/browser/setDesktopBackground.css
   skin/classic/browser/slowStartup-16.png
   skin/classic/browser/sync-desktopIcon.svg  (../shared/sync-desktopIcon.svg)
-  skin/classic/browser/sync-horizontalbar.png
-  skin/classic/browser/sync-horizontalbar@2x.png
-  skin/classic/browser/sync-horizontalbar-win7.png
-  skin/classic/browser/sync-horizontalbar-win7@2x.png
   skin/classic/browser/sync-mobileIcon.svg  (../shared/sync-mobileIcon.svg)
-  skin/classic/browser/syncProgress-horizontalbar.png
-  skin/classic/browser/syncProgress-horizontalbar@2x.png
-  skin/classic/browser/syncProgress-horizontalbar-win7.png
-  skin/classic/browser/syncProgress-horizontalbar-win7@2x.png
   skin/classic/browser/toolbarbutton-dropdown-arrow-win7.png
   skin/classic/browser/urlbar-popup-blocked.png
   skin/classic/browser/urlbar-history-dropmarker.png
   skin/classic/browser/urlbar-history-dropmarker@2x.png
   skin/classic/browser/urlbar-history-dropmarker-win7.png
   skin/classic/browser/urlbar-history-dropmarker-win7@2x.png
   skin/classic/browser/webRTC-indicator.css  (../shared/webRTC-indicator.css)
 * skin/classic/browser/controlcenter/panel.css                 (controlcenter/panel.css)
@@ -116,20 +108,16 @@ browser.jar:
 % override chrome://browser/skin/feeds/audioFeedIcon16.png            chrome://browser/skin/feeds/feedIcon16.png
 % override chrome://browser/skin/feeds/videoFeedIcon.png              chrome://browser/skin/feeds/feedIcon.png
 % override chrome://browser/skin/feeds/videoFeedIcon16.png            chrome://browser/skin/feeds/feedIcon16.png
 
 % override chrome://browser/skin/privatebrowsing-mask-tabstrip.png    chrome://browser/skin/privatebrowsing-mask-tabstrip-win7.png  os=WINNT osversion<=6.1
 % override chrome://browser/skin/privatebrowsing-mask-titlebar.png    chrome://browser/skin/privatebrowsing-mask-titlebar-win7.png  os=WINNT osversion<=6.1
 % override chrome://browser/skin/reload-stop-go.png                   chrome://browser/skin/reload-stop-go-win7.png                 os=WINNT osversion<=6.1
 % override chrome://browser/skin/reload-stop-go@2x.png                chrome://browser/skin/reload-stop-go-win7@2x.png              os=WINNT osversion<=6.1
-% override chrome://browser/skin/sync-horizontalbar.png               chrome://browser/skin/sync-horizontalbar-win7.png             os=WINNT osversion<=6.1
-% override chrome://browser/skin/sync-horizontalbar@2x.png            chrome://browser/skin/sync-horizontalbar-win7@2x.png          os=WINNT osversion<=6.1
-% override chrome://browser/skin/syncProgress-horizontalbar.png       chrome://browser/skin/syncProgress-horizontalbar-win7.png     os=WINNT osversion<=6.1
-% override chrome://browser/skin/syncProgress-horizontalbar@2x.png    chrome://browser/skin/syncProgress-horizontalbar-win7@2x.png  os=WINNT osversion<=6.1
 % override chrome://browser/skin/toolbarbutton-dropdown-arrow.png     chrome://browser/skin/toolbarbutton-dropdown-arrow-win7.png   os=WINNT osversion<=6.1
 % override chrome://browser/skin/urlbar-history-dropmarker.png        chrome://browser/skin/urlbar-history-dropmarker-win7.png      os=WINNT osversion<=6.1
 % override chrome://browser/skin/urlbar-history-dropmarker@2x.png     chrome://browser/skin/urlbar-history-dropmarker-win7@2x.png   os=WINNT osversion<=6.1
 % override chrome://browser/skin/downloads/download-glow-menuPanel.png  chrome://browser/skin/downloads/download-glow-menuPanel-win7.png os=WINNT osversion<=6.1
 
 % override chrome://browser/skin/tabbrowser/tab-background-start.png     chrome://browser/skin/tabbrowser/tab-background-start-preWin10.png     os=WINNT osversion<=6.3
 % override chrome://browser/skin/tabbrowser/tab-background-start@2x.png  chrome://browser/skin/tabbrowser/tab-background-start-preWin10@2x.png  os=WINNT osversion<=6.3
 % override chrome://browser/skin/tabbrowser/tab-background-middle.png    chrome://browser/skin/tabbrowser/tab-background-middle-preWin10.png    os=WINNT osversion<=6.3

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