v5.12.0

Tab Wrangler is now ready for Firefox. This release made changes necessary to make the extension work smoothly in Firefox. They are all minor and detailed below; they don't change what you know about TW, but now you can install it for Firefox as well.

Tab Wrangler for Firefox: https://addons.mozilla.org/en-US/firefox/addon/tabwrangler/

Enhancements:

#212: No message when tab list is empty and/or no search results
#185: Provide an official Firefox extension
a667e1b: Add Firefox's about: pages to default whitelist
5a64bbf: Use regular favicon URLs to be x-browser compliant