GHacks says: "The Classic Theme Restorer add-on for Firefox will stop working when Mozilla releases Firefox 57.0 Stable, and Firefox 59.0 ESR".
ARTICLE
Cee-Dee will be OK, they say that Pale Moon is the only FF-based browser that will still work at all !!! I use Waterfox and see some hopeful words in the comments to the article that I need to follow up on.
I'm referring the whole scandalous matter to you good people for learned opinions...
...because I am extremely busy with my birds - have been occupied the whole winter with various owls and the UK osprey season is about to kick off any day! Tech difficulties recur or newly emerge daily to plague me 😞