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Description of problem:
Firefox (firefox-52.0-0.7.el7_3.x86_64) does not allows you to install extensions from http://extensions.gnome.org/

Version-Release number of selected component (if applicable):
firefox-52.0-0.7.el7_3.x86_64
gnome-shell-browser-plugin-3.14.4-53.el7.x86_64

Steps to Reproduce:
1. install the test version of Firefox 52
2. visit http://extensions.gnome.org/

Actual results:
page says: "We cannot detect a running copy of GNOME on this system, so some parts of the interface may be disabled. See our troubleshooting entry for more information."

Expected results:
Page should see which gnome version I use and offer extensions

Additional info:
I have several other extensions installed, and they are all enabled like it was in Firefox 45 ESR, however some stopped working, like: cliget (
https://github.com/zaidka/cliget)

That's NPAPI plugin and it should be enabled in final ESR52. They're going to be disabled in next ESR59.

(In reply to Martin Stransky from comment #1)
> That's NPAPI plugin and it should be enabled in final ESR52. They're going
> to be disabled in next ESR59.

Now that we should have almost final build https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=541255 I believe we can try this issue again, correct Martin?

Yes, the NPAPI plugins should be enabled in the ESR52.

I can confirm that this is fixed in firefox-52.0-1.el7_3.x86_64

Marking as closed as of comment #4.

Discussion on how to handle the removal of NPAPI support is in bug 1609200.