The BEST if you install addons... see the code, is it dubious or not. More people should use it, but dummies be and dummies Chrome. FF users in the know GOT THIS!

Just great, allow to check what an extension does before dowloading and install it (well, if you now about coding...).
It should be followed and recommanded by Mozilla !!!

I agree with another comment: it would be great if could show addon-UID.
Thank you to the developper, who to care of answering to the other comment and provided an easy way to get thins info: go to address about:support and see below "Extensions"

Left side of list of file names is cut off for some file names..

Edit: thanks for the reply! the addon is very useful.

pretty well thought out and certainly very convenient - nice piece of work

Rated 3 because it does not show extension ID. So I'm resorting to the usual (my handy GFs... ...my hands)

So yeah, 3 stars for good intent and work. But this goes to trash-bin if it does show addon-UID right in the about-addons page two weeks from now (like the one I used to have 5yrs ago already but gone dead.... thx bushbama :-{ )

edit: That escaladed quickly ;) I just found what I needed all along (and already had)

Yep.... turns out that "about:debugging" is all I need. I just made a short-cut/fav in my bookmark-bar, right along side my "about:config" icon, and that's it ;)
Sorry, but this extension of yours is going to the trash-bin right now. But thx for making me search further.

Thank you Rob!
Works great even with FF older than 57.

For people who, do not understand much about javascript,css syntax or even html, but know how an ip and web-page address looks like, it is till useful to look at an extension source code.
In that regard would be very useful if you could made somehow a filter(search) that finds web-pages and ip adresses inside the source code of the extension. Now, someone can manually find them either by looking to all the lines in all the files(which is too much for most of us), or by searching "something", like '!.com' and then going with "next" trough all the files, but there are a lot of finds that are not addresses, like for ex. ".comments". The idea is to hit some desirably "search addresses" and to find only ip and web adresses, so then we could jump to each of them inside the code and decide next if further investigation or not is needed. Well, I was dreaming with my eyes open, but anyway, even if you wont do what I was trying to explain, you already have done a good job for over simplifying the reading of the source code.

Someone mentioned earlier in a comment, something about firewall for Firefox....well, uMatrix is the closest FF extension to a real firewall, that I know of. Check it out: https://addons.mozilla.org/en-US/firefox/addon/umatrix/

Cheers!

Great extension!
Thanks!!!