maintainer-feedback requested: [Bug 253902] www/firefox: cannot install add-ons

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-gecko (Nobody)
<gecko at FreeBSD.org> for maintainer-feedback:
Bug 253902: www/firefox: cannot install add-ons
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253902



--- Description ---
Overview:
If I try to install an add-on to Firefox, it never gets installed.

Steps to Reproduce:
1. Search for an add-on to install in Firefox (e.g. Ghostery).
2. Click on the blue "Add to Firefox" button.
3. A small permissions window will pop-up in Firefox near the address bar. 
Click on the "Add" button in that window.

Expected Results:
The add-on gets installed.

Actual Results:
The "Add to Firefox" button gets temporarily replaced by a gray box containing
a blue dot that moves back and forth.  Within a minute, the "Add to Firefox"
button reappears, and the add-on has not been installed.

Build Date & Hardware:
Firefox 86.0_2,2, FreeBSD_version 1104001, Dell Vostro PC, amd64