I've been using Firefox for over 10years and love it!
I have two suggestions:
1) New tab to open beside current/active tab (instead of opening at the end);
2) <Alt> to show pinned-bookmarks-bar when that bar is set to show on new tabs only.
I'm primarily interested in proposal #1. I've wanted this for a while. As always, implementing it as an option would be welcome! If that's done, I'm honestly not sure which option should be the default setting.
Proposal #2 should probably be split into a separate idea, either by the submitter or by mods. It is a wholly separate Idea. (I admit that I don't know what it is, and it's probably simply related to a feature that I don't happen to use.)
Sorry, I meant pinned-bookmarks-bar (not pinned-bookmarks-tab).
It'd be nice if that bar showed up when we press <Alt>.
It'd be nice to show the bookmarks bar when we press <Alt>.