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As Flash is closed-source, Adobe maintain it. Although they now only backport in security updates, and have not developed the Linux version beyond 11.2. For more information on how though to get the latest version of Flash on Linux read Thomas W.'s answer here.
I had the same problem and found out that ~/.config/gedit is not enabled for writing. So you have two options. This is cumbersome, but you could always start gedit as super user via terminal sudo -b gedit. You can change the permissions of ~/.config/gedit and all of its contents: sudo chmod -R 760 ~/.config/gedit
If you want, you can disable the blocklist using about:config: extensions.blocklist.enabled false or using prefs.js: user_pref('extensions.blocklist.enabled', false); blocklist.xml prefs.js
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