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Sharing profiles in Firefox 67 and Thunderbird 68, deleting compatibility.ini

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I recently switched to FF 67 and obviously using the same profile throughout multiple OS (Manjaro, Ubuntu and Windows 10 in my case) does not work anymore. The same applies to TB 68, I guess it's the same mechanism behind. I cannot comprehend what the devs thought here and I'm quite furious right now since this breaks up my whole setup. The official support page refers to Firefox Sync in this case, which I'm actually using, but that covers only a small portion of the now missing stuff. I cannot sync the current session, add-on settings, cookies, site preferences (like allowing cookies for certain sites), many settings (default search engine, telemetry etc.) and much more and for Thunderbird it doesn't work at all.

I found here - https://support.mozilla.org/en-US/questions/1260190?mobile=0 - that it's apparently possible to restore the old behaviour by deleting compatibility.ini but I'm not sure if this breaks things in Firefox or Thunderbird, I obviously don't want to lose my bookmarks, open tabs or other stuff. How risky is this and are there alternatives? Many thanks for helping me.

I recently switched to FF 67 and obviously using the same profile throughout multiple OS (Manjaro, Ubuntu and Windows 10 in my case) does not work anymore. The same applies to TB 68, I guess it's the same mechanism behind. I cannot comprehend what the devs thought here and I'm quite furious right now since this breaks up my whole setup. The official support page refers to Firefox Sync in this case, which I'm actually using, but that covers only a small portion of the now missing stuff. I cannot sync the current session, add-on settings, cookies, site preferences (like allowing cookies for certain sites), many settings (default search engine, telemetry etc.) and much more and for Thunderbird it doesn't work at all. I found here - https://support.mozilla.org/en-US/questions/1260190?mobile=0 - that it's apparently possible to restore the old behaviour by deleting compatibility.ini but I'm not sure if this breaks things in Firefox or Thunderbird, I obviously don't want to lose my bookmarks, open tabs or other stuff. How risky is this and are there alternatives? Many thanks for helping me.

Modified by floriansauer

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

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cor-el
  • Top 10 Contributor
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17416 solutions 157342 answers

There are some files that cause issues if you share a profile among different OSs. An example is pkcs11.txt that stores data about the software security device manager that needs to be accessed via a port pair and this file stores an absolute path to the profile folder. This causes the Password Manager to malfunction. Sharing a profile has never been supported and you do this at your own risk. Deleting compatibility.ini will invalidate the startup caches and re-initializes a profile folder.

There are some files that cause issues if you share a profile among different OSs. An example is pkcs11.txt that stores data about the software security device manager that needs to be accessed via a port pair and this file stores an absolute path to the profile folder. This causes the Password Manager to malfunction. Sharing a profile has never been supported and you do this at your own risk. Deleting compatibility.ini will invalidate the startup caches and re-initializes a profile folder.
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