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@decembre I don't know if this is any help but I installed your SEM 48.0.4 from the previous page on a laptop with FF48. The search bar shows up for me on the standard editor if I toggle it off and on again in the settings when I open the editor. It has to be done each time the editor is opened unfortunately, but at least it's usable.
Ha yes , i tested and it seems fine (support 64bits too!)
I had just a problem to pass my interface in French...
Their package do nothing and i crash my profile with an addon which should do the job ... but not.
Solved by deleting it in my profile folder, and download the Mozilla Official French Package...
But now, I use Waterfox since a couple of hours without significant problem.
I don't know if it's problem (the crash was effective in Waterfox AND Firefox too) , but is is practical:
Waterfox use the same Profiles folders than firefox.
I keep all my customization when i toggle between Moz or Water.