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Firefox version 10.9.5 cannot be restored

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I had to restart my MACOS10.12 and tried to restore Firefox but could not due to new version (91.8) which is unavailable on my MAC. I restored 78.5, however all of my bookmarks have been lost. Can you let me know how I can restore them?

I had to restart my MACOS10.12 and tried to restore Firefox but could not due to new version (91.8) which is unavailable on my MAC. I restored 78.5, however all of my bookmarks have been lost. Can you let me know how I can restore them?

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Your System Details shows a Mac OS x 10.9 and that Mac OS version doesn't support Firefox beyond Firefox 78.15.0 ESR.


Firefox 78.15.0 is the last version for your Mac OS X platform (update channel: mozilla-mac-eol-esr1) and you will no longer receive updates, so you are out of luck if you can't update your OS. Current releases require Mac OS X 10.12 or newer.

Firefox 78.15.0 on the Mozilla CDN server:

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