The ToolSidebar and TabBar should be able to take an index to specify where in the TabBar the new tab can be added. I have an use case where I am pushing and popping out the Rules view in Bug 1369945 to create a 3 pane inspector view. I need to be able to specify an index when adding a tab so that the Rules view can be inserted back to be the first tab in the ToolSidebar in the Inspector.

Comment on attachment 8914443 [details] Bug 1405063 - Adding a tab in the TabBar should be able to take an index to specify where to add the tab. https://reviewboard.mozilla.org/r/185756/#review191074 Looks reasonable, thanks! R+ assuming try is green and my comment is resolved. Honza ::: devtools/client/shared/components/tabs/TabBar.js:82 (Diff revision 1) > }, > > // Public API > > - addTab: function (id, title, selected = false, panel, url) { > + addTab: function (id, title, selected = false, panel, url, index) { > let tabs = this.state.tabs.slice(); We can provide default -1 for the index argument.

Pushed by gabriel.luong@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/bfde202ada8a Adding a tab in the TabBar should be able to take an index to specify where to add the tab. r=honza