Extension Manager Extended adds more details about your installed extensions: the install date which can be useful to diagnose some problem it may have started; plus, the extension ID, usually a long alphanumeric string that uniquely identifies it within Firefox, Thunderbird and Sunbird.
It also adds a Open Containing Folder option to the context menu to quickly move to the extension folder.

Actually, I would like for it to check the memory usage of some extensions, so that it is easier to determine which extensions use the most resources and help identify memory leaks.
Sure, but Firefox addons are made by XUL, usually some JavaScript, sometimes some random library (DLL) calls to system libraries and a whole lot of different possible combinations of various random stuff.
Until all addons exist of one XUL file linking to one DLL file it’s impossible to track what’s using how much memory without the tracker itself using a couple of megabytes (+20?).
mozilla links





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Nice! This should be part of the core though…
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