[gnicholas]

Yep, I'll be limping along on the "old" version of Firefox so that I can use Tree Style Tabs, which can't be made compatible with the new extension framework. And my startup may or may not update our own Firefox extension this year. We're waiting to see how things shake out — how many people update to the latest version of Firefox, or whether folks are tied to the old version because they have so many legacy extensions.

[olejorgenb]

https://addons.mozilla.org/en-US/firefox/addon/tree-tabs/ use the new extension api AFAIK. Seems you have to go through some hoops to hide the regular tabbar though.

[jhasse]

Unfortunately it draws its own context menu which looks very ugly, doesn't behave native and interferes with dom.event.contextmenu.enabled=false.

[nialv7]

Well if you decide to stick with an older version of Firefox, you might just as well stick with PaleMoon instead. At least it's still getting some new features and security fixes.

[gnicholas]

Would love more details!

[richardboegli]

http://www.palemoon.org/

Fork of tree style tabs for Pale Moon

https://github.com/oinkin/treestyletab

[Endy]

I suggest that you switch over to development for Pale Moon. There are lots of positives behind it, and all that I've heard is that they have no plan at the moment to switch over to WebExtensions.

[richardboegli]

I second switching to Pale Moon.

Someone has forked Tree Style Tabs so that it works with latest Pale Moon.

[mavendependency]

The testpilot program from mozilla has a beta test for sidebar tabs. This is still not tree, but can be a decent alternative if you need tree style tabs to reclaim screen real-estate.

[thristian]

The sidebar tabs testpilot extension is also not a WebExtension, so it will stop working at the same time as TreeStyleTabs.

Tab Center Redux <https://addons.mozilla.org/en-US/firefox/addon/tab-center-re... is a fork of the testpilot extension that is a WebExtension, so it works fine in Firefox Nightly. It's naturally more limited than the original extension, though: it can't hide the top tab-bar, it has to draw its own context-menu, it can't be shown at the same time as any other sidebar, etc.

It's still nicer than the top tab-bar for those of us with a bunch of tabs open, though.

[vetinari]

Tab Center (the extension for sidebar tabs from testpilot) is already down, with no replacement. For existing users, it will stop working with FF56.