Ok so you just did an upgrade on Firefox using the package manager in Ubuntu or other linux distribution and you getting this error (fig.1)
Note: firefox needs to be closed before appling updates, it being open during a firefox update can cause the problem.
I found the easiest way to fix firefox ubuntu back to the way it was is to:
- Restart Ubuntu (or what ever distribution you are running) then load firefox again
- if this doesn't work try make a backup of the hidden folder under your home drive called ".Mozilla" then remove the folder & restart Gnome.
- Also worth trying is removing & re-installing Firefox from the Package manager under System -> Administration -> Package Manager.
Hopefully this will fix this issue,
ASSERT: *** Search: _installLocation: engine has no file!
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)