Simply don't work at all

DO NOT USE. It will NOT save your hightlights in academic database sites like ProQuest. It might save your highlight for a day or so, but will randomly fail to load them DO NOT RELY ON THIS.

Not reliable. My highlights and notes disappeared after refreshing the page. I think the issue was related with multiple pages having the same title, although different file names. I'm working with local HTML files.

Although Text Marker functions well, it has a conflict with Google Docs and Google Sheets that causes computer memory to saturate, leading to either the computer locking up (usually) or FireFox crashing.

Text Marker as the cause was hard to track down (trial and error with the extensions I use).

SYMPTOMS: My computer has 16 gb of RAM, and typically is running with 8 or 9 gb free memory. As soon as I load one of the Google workspaces I start getting pops saying (initially) trying to connect, and then repeatedly "reconnecting". The "memory commit" (observed with ProcessExplorer) quickly runs up from a few gigbytes up over 30 GB, and I've seen as much as 36 GB at the crash point. Meanwhile, the free memory runs down to a few thousand MB (MB!) and eventually to only 92 MB.

I have isolated this problem to Text Marker as the cause. I get a similar problem when doing lots of scolling through statutes, for example here: https://www.akleg.gov/basis/statutes.asp#43.55.020

Terrible experience. Everything just disappears after all my effort of highlighting.

Good, very useful idea, sadly not well developped, for example on pages with expandable content, markings are not restored (the "page can change" function does not help).

Fonctionne pas !

>>> NO ACTUAL SCREENSHOTS OF EXAMPLE MARKUP ON PAGES! <<<

Crazy resource consumption.
If you use many tabs, please DO NOT INSTALL, or your Firefox will freeze and it will be really hard to remove the extension.

@Developers: no, my computer is not slow (like you replied to another user). You should learn how to optimize your code instead of blaming users that complain about it.