Remove (or put disclaimers on) addons that are already baked into firefox

[mozillian]

Some features from some addons have been baked directly into firefox over the years, i believe there is null use for them to exist (except for forks that use old firefox engines) and should be marked somehow at the very least

[Jon]

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[mozillian]

Just one extension as example is Easy Screenshot.Though i know there are many more.