'Installing' Firefox Portable won't interfere with your regularly installed version - it's self-contained inside the folder you directed the PortableApps installer to unpack the files into. If you just wanted to try out the most recent version and see if you like it then you can download and install Firefox Portable from Portable Apps - just scroll down the page for different locale versions. I use the the latest version, Firefox 65.0, on Windows 7 SP1 圆4 and find it really good. In the longer run you'll likely get forced off of old versions of Firefox that can manage (now called) 'legacy' addons. I think it really depends how important certain Add-ons are for you. Im using the Add-On Classic Theme Restorer with FF 45.9 ESR for example. But firefox isnt the browser I use for e-mailing, its just for certain sites Im relatively sure that wont lead to malware. But 45.9 is also one of the last Firefox versions to support alot of the good Add-Ons. So is there any consensus as to the 'best' version that maintains good compatibility with old addons yet gives acceptable screen -rendering performance?Įxcept for 'Stylish' I never tried those Add-ons. It doesn't render the content of some pages - it leaves big black sections that I can make to appear if I drag the FF window off-screen and bring back on-screen.

My addons:īut I find this 45.9.0 version horrible. I looked through the FF version history and decided to download the 45.9.0 ESR package, and I ran it, and it now starts fine, and my short-list of add-ons is intact and seemingly functional. I didn't want to do that, but I found no instructions as to how to force it to start normally. My version 39.0 FF got stuck in starting in safe mode, and the only option was for me to continue starting it in safe mode or 'refreshing' it - which means nuking all my addons (so it says).

Old version of firefox for windows 7