Add the cssRuleView to the Highlighter's Sidebar.
Created attachment 571709 [details] [diff] [review] WIP 1
Created attachment 571728 [details] [diff] [review] WIP 2 behavior seems to be fixed, added entries to inspector.properties for strings. Just haven't checked the tests yet.
Created attachment 571761 [details] [diff] [review] RuleView in Sidebar Updated patch, added unittests, cleanup code and improved functionality.
Comment on attachment 571776 [details] Mac Screenshot wrong place for the screenshot.
Created attachment 571994 [details] [diff] [review] RuleView in Sidebar 2 Updated version. More tests. Checks for and disables extra set buttons in sidebar. Tests tab switching with sidebar tools active.
current try build running here: https://tbpl.mozilla.org/?tree=Try&rev=4bfaea2d57cb