Firefox for Android Support Forum

I've been using Firefox Nightly for Android and Firefox for Android for years without issue. I've left Nightly at build 68.5a1 as it has several features that later bulds removed. I sync across all my mobile devices but NOT with my desktop. When a website requires a newer browser version to run, then I switch to plain Firefox.

Today Nightly would NOT open. It opened and pointed to an offline file. I noticed it was marked by "///". I'm sorry I didn't take a screenshot or note the file.

Reading several posts, I removed Nightly, purged the cash and purged the data. Then I reinstalled Nightly from the apk file I saved. While the install went without a hitch, it will NOT permit me to sign in to synch the data saved in all my other devices. It just spins as this image shows.

I read a post indicating a direct url for sign in and tried it. But it only worked for Firefox and NOT Nightly.

How do I resolve this?

I just needed to reset my kindle hd 10 to factory. When I try to sign in to firefox in order to sync bookmarks, the page won't open but only spins. I was able to sync bookmarks when I bought the kindle in December. Thanks.