Hellllooo Mozilla Connect! We want to thank those folks (2,852 of you!) who participated in the Firefox User Research survey on feature priorities we posted here last month. If you recall, this survey showed participants multiple sets of 3 random browser features, then had participants pick whether...
I think you might be looking for this?
https://addons.mozilla.org/en-US/firefox/addon/side-view/
Yes, that’s it. Didn’t realise it’s an add-on. Thanks, Charmain Meow (spare the sparrows this time 😄 ).
This is gonna be very useful! 😃