If it happens on Firebox but not on Edge, it could be an issue with one of your plugins. I can't seem to create the bug on Firefox on my side.
I would recommend disabling your plugins one by one to see which plugin is causing the issue. If you know how to check for console errors on Firefox, please post the error here.
I have uninstalled every plugin/extension I had on Firefox, no dice. Tried resetting the cookies again, still doesn't work. And now Edge won't work either. I am currently incapable of editing my existing chapters at all (Published or Draft alike).
Update: It works, but it's very weird and inconvenient. If the chapter is small enough and I edit it directly on SH's editor, things go smoothly. But as soon I try to update a large chapter, it won't work. BUT, if I copy and paste that chapter's content onto Google Docs and then copy and paste from Docs back to SH's editor, it suddenly works again... ???????
Here are some symptoms that I could gather:
-Save Drafts, Publish, Update and Schedule won't work. Once I press any of them, the buttons freeze (Saving.../Publishing.../etc.) and nothing will happen no matter how long I wait.
-The buttons work if there are no edits made in the chapter.
-Creating new chapters works fine.
-As I mentioned above, copying and pasting the chapter back and forth onto Docs works, for some reason.
My only guess was there's some sort of formatting/character that prevents me from updating a chapter and they were removed when I paste it onto Docs. But, I'm not a tech guy, what do I know?
Please, I need to know what causes this so I can fix it (if it was on my end). Looking forward to any response!
Update 2: Sometimes it works, sometimes it won't, I don't even know anymore.