Also using Waterfox Classic and experiencing this issue.
I tested editing a main post in Brave and the issue is not present there.
I haven't been able to pinpoint the cause of the issue in Waterfox yet.
For me, trying to edit a main post or even view the source for it in Waterfox goes from this:
To this:
Instead of this:
And carriage returns and formatting do not function properly or at all within the post, but all changes are apparent during preview and stick after submission.
Going to run more extensive testing tomorrow to see if I can determine the cause.
Are you using a custom global CSS?
/s/books doesn't look like the one in your screenshot at all.
Sorry, I accidentally forgot to disable it for the screenshots. I can take the shots again with it disabled if you would like, but the issue is present with all CSS changes disabled.
Here they are again with the CSS properly turned off:
From this: https://files.catbox.moe/ysnd7d.jpg
To this: https://files.catbox.moe/5ncdmz.jpg
Instead of this: https://files.catbox.moe/8si21x.jpg
(put my saved body text for that post into a comment to show how it normally looks when editing)
Side note, I am using Waterfox Third Generation. I gave up on Classic.
(post is archived)