For Firefox
Please, is there anything?
For Chromium and Google Chrome
SimpleExtManager is simple and effective –
– and there’s active development.
Retrospective
In the 1990s, for System 7 and Mac OS we had Apple’s Extensions Manager:
Image sources:
- The Essential Mac - System (1997)
- Make Your Classic Mac OS Machine Faster | Low End Mac (2001-05-09)
Multiple Addon Deactivator (M.A.D.) was last released in 2012, no longer compatible with Firefox –
– or SeaMonkey (there’s a list of add-ons but check boxes don’t work, and so on):
More recently, Extensions Manager (aka Switcher) for Google Chrome –
– not for Firefox and it’s reportedly abandoned (no longer able to work with user-defined groups/sets).