I think the main problem here is the ideology of software updating. Updates represent a tradeoff: On one hand there might be security vulnerabilities that need an update to fix, and developers don't want to receive bug reports or maintain server infrastructure for obsolete versions. On the other hand, the developer might make decisions users don't want, or turn even temporarily (as in a supply chain attack) or perman…
If the extension does something that isn't changing, like JSON Formatting, I guess it's best to disable updates right after you install it. I just did this for all extensions I have in Firefox. Not sure about extensions like uBlock though? Doesn't it fetch new lists of sites to block or something like that? Or is that done separately from updates?
It's done separately from updates.
I also disable auto updates for extensions and I keep extensions that I don't need daily installed but disabled.
It's annoying that firefox doesn't have a "Update all" button but clicking manually on a handful of extensions once a month isn't that much of a chore :shrugs:.