Hi, thanks for your extension, it is good, but I cannot use it. At least just now.

I recently get updated to Firefox 57 and lost VimFX extension. So, my experience with your extension contradicts with my previous experience - it is the reason why I can't just use your extension.

Here you can find some feedback from me: suggestions, positive and negative comments
* I'm using Tree Style Tab and used to K as go to the next tab to the bottom and J as go to the previous tab to the top (like j is go down and k is go up in vim). But here J is go up and K is go down. Really confusing me. (UPD: I found how to change default keybindings, will try to solve this problem)
* This extension doesn't work until the page is not loaded fully and also doesn't work on default Firefox pages (like new tab). I guess it is a problem of plugin API of new Firefox, but in any case it is sad.
* f to start following the links in the page: in VimFX I had possibility to select between opening tab in current tab and opening tab in a new tab (f and F respectively). Moreover, opening a link in a new tab in VimFX creates a sub-tree in Tree Style Tab, but not in your extension.
* Hotkey for opening help at any time would be useful (something like '?' for example)
* Nice Ctrl+U and Ctrl+D hotkeys!
* "console" is a nice feature!