This issue isn’t tied to a specific build—it has been reported across various versions, including 94.0.2, 63.0.3, 120.0.1, and others. Fortunately, it’s a fixable problem. The solutions below will guide you through resolving it and restoring Firefox to working condition.
1. Temporarily Disable Antivirus During Installation
If reinstalling or updating Mozilla Firefox results in the “Platform version is not compatible with minVersion” error, your Windows Security settings or third-party antivirus software may be interfering with the installation process. These security tools can block or quarantine essential Firefox files during installation or updates. To avoid this, temporarily disable Windows Security before reinstalling Firefox.
2. Reinstall Mozilla Firefox Without Uninstalling
Reinstalling Firefox over the existing installation can replace corrupted or mismatched files caused by an incomplete update—without deleting your personal data. This method retains your bookmarks, browsing history, passwords, and other profile settings, making it a safe way to repair the browser.
3. Perform a Clean Installation of Mozilla Firefox (Only if Necessary)
If reinstalling Firefox without uninstalling didn’t fix the issue, you may need to perform a clean installation. This will completely remove all corrupted files and user data, giving you a fresh, working copy of Firefox. Note: This process will delete your bookmarks, history, saved logins, and settings unless you back them up first.
