: Versions ending in "esr" (Extended Support Release) are often the best choice for older Macs as they receive stability updates for longer periods.
: If Firefox won't open after downgrading, you may need to delete the compatibility.ini file in your Firefox profile folder to allow the older version to read your existing data. mozilla firefox old version download for mac
: Using outdated browsers exposes you to known vulnerabilities. Avoid using legacy versions for sensitive tasks like online banking or entering credit card information. : Versions ending in "esr" (Extended Support Release)
Installing an older version can sometimes cause "profile errors" because newer versions change the way user data is stored. 115.0 or 78.15.0esr ).
: Browse the list for the version number you need (e.g., 115.0 or 78.15.0esr ).