Firefox ESR Compatible?

[steph...@gmail.com]

Good Morning... I'm finding that Color That Site! is stalling (failing to complete) with "Please wait, processing styles... Bitmaps are recalculated..." There is no action in the progress bar under the Bitmaps message. I've happily used CTS! with the old Firefox (pre-Quantum) and now with Waterfox. My only reason for leaving Waterfox for Firefox ESR is to get faster security updates. If CTS! is not compatible with Firefox ESR then my Plan B is to (perhaps) restrict my use of Waterfox to the one important site where I need CTS! And so my question: is CTS! is compatible with Firefox ESR? Thoughts? Many thanks. Stephen