I did not test all functionality of this plugin, only the search functionality.
Does not search all open windows for all tabs. Only searches one window.
You must have one window open will all tabs in this window to use this addon's search feature across all open tabs. I currently have 16 browser windows open. Most of which have several tabs open. I have them divided by projects and tasks. I have to click one by one to find the site I need to be working on.
There is a plugin that does this for chrome. I don't want to use chrome, today!

Why 5 stars? The other features work wonderfully.