Replies

"The older version can be installed concurrently with the current version which would be better for general use."

I didn't realize two versions of FF could be installed and used independently. Will give it a try. Thanks.

It depends on the operating system and how old the old version is. You may have to go way back to get one that will install in a directory selected by you and completely self-contained. You might run into a problem with https not being supported now that I think of it.

I didn't realize two versions of FF could be installed and used independently. Will give it a try. Thanks.

Years ago, I found that if i installed Firefox Quantum while using - Firefox ESR 59.02 - the last version legacy extensions work with - then Quantum would take that over. So I prayed and pressed to find a solution, which was Firefox Portable.

As a result, I am blessed to (have 128GB RAM and ) run multiple installations of Firefox portable, each for its own general purpose, and which load separately.

But to enable then to run concurrently, in your profile folder you need place and edit a copy of the FirefoxPortable.ini from Other\Source to the main folder of FirefoxPortable (in Windows, not Linux, you can just right click on the shortcut Firefox icon, then hit Properties, then Open File location which is where you want to place FirefoxPortable.ini, which is to be found, copied from in the Other>Source folder. Paste and then edit/change that FirefoxPortable.ini to AllowMultipleInstances=true DisableIntelligentStart=true.

And in W/11 to enable separate taskbar icons I had to set “taskbar.grouping to True in About:Config

I also run two "stand-alone" installs of Chromium-based Vivaldi, and 2 of Gecko (Firefox) - based Floorp
(from Japanese students). FF extensions work on it, and even You can install multiple copies just by installing separate installations and running them from there.

CynwoodyFRpostfEnhancer works with Floorp and FirefoxPortable. See here for my upload of FRpostfEnhancer as it was written. I save many extensions but should do more.
Reviews: https://www.fastcompany.com/91038756/why-floorp-has-become-browser-of-my-dreams; https://discuss.getsol.us/d/10747-floorp-browser https://windowsforum.com/threads/floorp-browser.338083/ https://forum.artixlinux.org/index.php/topic,6362.0.html

Hope this helps