Firefox has been downgraded to version 52.8 (Firefox-ESR) after latest updates … I don’t understand what’s happening … Lot of plugins are not supported in this version (52.8)
It is not downgraded, just the launcher point to the the firefox esr (which is the 52.8).
Removing the firefox esr solve the problem.
Yes I realized it later … but anyway … thankyou …
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How to remove the Firefox ESR? Do you mean uninstall?
Yes.
sudo apt purge firefox-esr
For everyone who wants the latest firefox version : http://libre-software.net/how-to-install-firefox-on-ubuntu-linux-mint/