There are some files in ~/Library/Application Support/Firefox that are all-user -- those in `Crash Reports` and `Pending Pings`. So there could be others. There also could, in principle, be another subdirectory of ~/Library/Application Support/Firefox devoted to settings that are "by version", instead of "by user". The second possibility, especially, would probably require some serious design changes. But I think these ideas are worth considering, for the medium to long term.
Bug 1799332 Comment 31 Edit History
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There are some files in ~/Library/Application Support/Firefox that are all-user -- those in `Crash Reports` and `Pending Pings`. So there could be others. There also could, in principle, be another subdirectory of ~/Library/Application Support/Firefox devoted to settings that are "by version", instead of "by user". The second possibility, especially, would probably require some serious design changes. But I think these ideas are worth considering, for the medium to long term. The "bouncing back and forth" might actually be a good thing, if it can be managed properly.
There are some files in ~/Library/Application Support/Firefox that are all-user (or more precisely "all-profile") -- those in `Crash Reports` and `Pending Pings`. So there could be others. There also could, in principle, be another subdirectory of ~/Library/Application Support/Firefox devoted to settings that are "by version", instead of "by user" (or "by profile"). The second possibility, especially, would probably require some serious design changes. But I think these ideas are worth considering, for the medium to long term. The "bouncing back and forth" might actually be a good thing, if it can be managed properly.