It never worked since I installed it like 3 weeks ago. My case is the same than the one of the previous reviewer. I need it mostly for one website. When trying to enable it I get the same error: "Network error..." Firefox and add-on are updated, 115.26.0es and 1.2.9 respectively. Not using any other proxy or VPN.

Update due to developer's reply: I'll contact you providing info on the questions asked. I would like to add that I just tried the Chrome extension and it works. So it might be something related specifically to Firefox.

Update 2: I solved it. When filling up the support request I decided to give it a last try and discovered that when installing the add-on there's a fugacious message I can't read nor accept that precedes the aforementioned error. So I recorded my screen and play in slow motion and saw there's a message asking for permissions. After googling I went to the add-ons page and selected the extension and then its Permissions tab and enabled them and it worked. Might be kind of a bug that prevents the message to stop.