Bug 1499294 - Don't truncate plugin state select r=jaws

Differential Revision: https://phabricator.services.mozilla.com/D9015

--HG--
extra : moz-landing-system : lando

toolkit/mozapps/extensions/content/extensions.xml

@@ -670,7 +670,7 @@
             <xul:hbox anonid="install-status" class="install-status"
                       hidden="true"/>
           </xul:hbox>
-          <xul:hbox anonid="control-container" class="control-container">
+          <xul:hbox anonid="control-container" class="control-container" flex="1">
             <xul:button anonid="preferences-btn"
                         class="addon-control preferences"
 #ifdef XP_WIN
@@ -695,6 +695,7 @@
                         oncommand="document.getBindingParent(this).uninstall();"/>
             <xul:menulist anonid="state-menulist"
                           class="addon-control state"
+                          flex="1"
                           tooltiptext="&cmd.stateMenu.tooltip;">
               <xul:menupopup>
                 <xul:menuitem anonid="ask-to-activate-menuitem"