. . . . Firefox >= 57 has destroyed the best UI experience!

When Mozilla changed Firefox to the Quantum browser, the add-ons that did those things became obsolete. I am still using v54 as my default.

I have observed that work offline is possible only when site has been verified which makes it nightmare.

What is it you are trying to do?

Hi, FredMcD,

Thanks for your time and reply.

I am trying to open/browse pages which were opened one day, one week, one month ago while (currently) being offline. Unfortunately, the "green" padlock never appears.

I think when pages are loaded from the cache, a warning triangle may be displayed on the lock. Is that the only issue, or is the page not working, either?

Also, there is no way to globally set Firefox not to care about invalid certificates.

Hi jscher2000,

Thanks for your time and reply.

I always get, soon or late, the content of the "screenshot_1" attached herewith.

Please have a look at the add-ons installed, although, I face no problem with them in Firefox <= 56.

I think the problem is that the Github home page can't be displayed from cache, possibly because the files in cache expired, or were cleared in some other manner, or the site didn't allow them to be cached, or the page has some kind of refresh script that isn't compatible with offline browsing. If this only happens intermittently on the site, my guess would be expiration.

Attached please find screenshots from "Waterfox-classic". Everything works fine with Github, etc. I can open any old page with zero effort! I can connect/disconnect in the network any times I want, I can restart the waterfox any times I want, I can reload any page any times I want, and old pages still there on my screen when I work offline. New "Firefox" looses the ball almost immediately! One restart and one reload while being offline and any old page magically disappears!