feature: Display opened tabs list when activating the extension

[netimen]

Hi Loren, thanks for excellent job!

I have a small feature request. Currently I use Quick Tabs extension for fast tabs navigation. And Ferro is much greater than Quick Tabs except one small thing:

When I activate Quick Tabs, it displays the list of opened tabs, so it's much easier to find a tab I need (I don't have to remember tab title etc). Also when I hit enter, Quick Tabs takes me to previous used tab. So to switch between two most used tabs using Quick Tabs, I only have to hit Alt+T to activate the extension and then hit Enter.

In Ferro I have to hit Alt+X to activate extension, then enter some title symbols and then hit Enter which is much less easy thing to do. So it would be great to display tabs list at Ferro start, sorted with LRU order.

[lorensr]

Thank you! Great idea. I'm busy these days, but a PR is welcome :)

[netimen]

I'm no frontender, so I can't do that unfortunately. But it can wait :)