* Due to file format differences, the two versions should NOT share the same profile folder so you need to create a new profile before installing Firefox 57 But you might find documentation from others on this forum, the Mozillazine forums, or elsewhere on the web. Sorry if this sounds like good backups are required and improvisation is inevitable, but I think those are both true. That method creates problems for links in external programs, so depending on which you plan to use more (57 or ESR) there may be an alternate approach."C:\Program Files\Mozilla Firefox\firefox.exe" -P "newfor 57" "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P "default" This involves editing the command line of the shortcut (Properties > Shortcut > Target field) with the profile name, e.g, You will need to create separate shortcuts to each version that points to a specific profile folder.As a workaround for that, you might try renamingīut I haven't tested that myself to make sure Firefox 57 ignores it Firefox 57 has a more aggressive installer that cross-checks for the 32-bit folder.Due to file format differences, the two versions should NOT share the same profile folder so you need to create a new profile before installing Firefox 57.I have 32-bit ESR and 64-bit Firefox 57 coexisting on a Windows 10 test machine. Loe vastust kontekstis ? 1 All Replies (14) Also, legacy extensions you install in Firefox 52 ESR are not compatible with Firefox 57, and some new extensions in Firefox 57 require features not available until Firefox 56 or later, so sharing a profile with any number of extensions could be a disaster that doesn't wait long to happen. It also may record a flag that it modified the file already and become confused if the file has the older format. When a newer version of Firefox uses a profile folder, it upconverts any files that have a different format, and that may create incompatibilities with older versions. Even though they are in different program folders, if not told what profile to use, each Firefox will look to a single file named Profiles.ini to see what profile folder is the default profile and use that. The profile folder holds your data (e.g., bookmarks, passwords, history, settings, add-ons). If it's not running, I'm not sure what will happen or what profile will be used.ĭo I need to have different profiles (since each shortcut will point to s specific Firefox) ? If Firefox 57 is already running, the odds are the link will open in Firefox 57. A key point for me is that the links in my E-mail software should open the correct FireFox (probably the Quantum after I have made sure it works for most of my applications).
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