How to install multiple versions of Firefox

For many years, I use Firefox on multiple versions of Mac OS X.
For compatibility reasons, I have to keep the last 3.6.28 and I would like to use the latest version.

Until version 35.0.1 it wasn't a problem at all to have multiple versions installed.
The problem began with 36.x and remains also with the latest 38.0.

Problem: all booksmarks disappear when switching between versions. The browser history also disappears.
How to reproduce the problem:
I throw the old version 3.x, all booksmarks are there. Then I stop 3.x.
Then I run the latest version 36.x or 37.x or 38.x and all booksmarks are still there. Then, I'm closing this version.
Back to 3.x all bookmarks disappeared. In any version of FF.

I need to recover the Firefox folder in the application to return to the 35.0.1.

Any help would be really appreciated.

Best wishes from the Germany,

Boris

If you use the time Machine, then you could try to restore files from the backup.

Tags: Firefox

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