Starting in Firefox 87, Firefox caps the reported Mac OS X version number to 10.15, so macOS 11.0 Big Sur and later will be reported as '10.15' in the User-Agent string. Other languages: Download Firefox in your language from and copy it to: 'Portable Firefox.app/Contents/Resources/' folder. Here, x.y is the version of Mac OS X (for instance, Mac OS X 10.15). So, if you wish to use your bookmarks, add-ons, history, personal data and preferences you already have on your system, just click 'Copy' when prompt, and select the folder '/Users/ /Library/Applications Support/Firefox/Profiles/********.default/' Using your data: You can copy your local Profile folder to Portable Firefox when 'Copy local Profile' window ask you.
Drag the 'Portable Firefox OS X' folder to your portable device, USB thumb drive, iPod, portable hard drive, memory card, other portable device (also to your internal hard disk) as long as it has 75 MB of free space.
Portable Firefox is the popular Mozilla Firefox Web browser packaged so you can carry around with you on any portable device, USB thumb drive, iPod, portable hard drive, memory card, other portable device (also on your internal hard disk) as long as it has 75 MB of free space and use on any Mac OS X computer, taking your bookmarks, extensions, history, cookies, and saved passwords with you
