Bug 1453954 - Stop collapsing the tabs toolbar by default. r=johannh

MozReview-Commit-ID: 2ZSGptrzwSC

--HG--
extra : rebase_source : b46bcee9779d9607772dfa09d5efab86785907ce

browser/base/content/browser.css

@@ -168,14 +168,6 @@ panelview[mainview] > .panel-header {
   visibility: hidden;
 }
 
-.tab-close-button,
-.tabbrowser-tab::after,
-.tab-background {
-  /* Explicitly set the visibility to override the value (collapsed)
-   * we inherit from #TabsToolbar[collapsed] upon opening a browser window. */
-  visibility: visible;
-}
-
 .tab-close-button[fadein],
 .tabbrowser-tab[fadein]::after,
 .tab-background[fadein] {

browser/base/content/browser.xul

@@ -640,8 +640,7 @@
              customizable="true"
              mode="icons"
              aria-label="&tabsToolbar.label;"
-             context="toolbar-context-menu"
-             collapsed="true">
+             context="toolbar-context-menu">
       <hbox class="titlebar-placeholder" type="pre-tabs"
             skipintoolbarset="true"/>