In about:config set browser.tabs.opentabfor.middleclick to true and instead of Ctrl + Click use Shift + Click on links to open them in new windows instead of tabs.

Also uncheck "Open new windows in a new tab instead" in Options in GUI or set browser.link.open_newwindow to 2 instead of 3 (it's the same thing) to make pop ups open in new windows instead of tabs.

There might be an extension to remap the Ctrl/Shift shortcut or abandon tabs altogether but I don't know of any.

Googling turns up results like https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus/ but it's of course not compatible with Quantum.

Thanks. I think I already did most of those. But the tab bar is still there, taking up space. And apparently I can't remap keys without an extension, or something.

You can disable the tab bar with a "user chrome" file such as https://github.com/cmcaine/tridactyl/blob/master/src/static/... (instructions at top of file).

Mozilla is making noises about disabling this eventually, but it works for now.

> the tab bar is still there

I've been using https://addons.mozilla.org/en-US/firefox/addon/hide-tab-bar-... but it seems this isn't going to make it into the Firefox Quantum era. :(

I use tree style tabs, and wanted to get rid of the redundant tabs at the top. I used the following:

https://github.com/piroor/treestyletab/issues/1525

You can turn them off. Instructions here,

https://superuser.com/questions/1261660/firefox-quantum-ver-...

works for me: https://i.imgur.com/ZMmJlZT.png

A bit of googling suggests that (historically at least, possibly still true) there isn't a built-in way, but you could with an addon. Most likely an addon can still do this - detect tab-open and convert to window-open ¯\_(ツ)_/¯

I don't have any implementations I can point to, though. And a brief browse of about:config didn't yield anything interesting.