Potentially a great extension, but I have the same problem with high cpu activity that others have reported. I don't know if this is a coincidence, but I only have this problem on Windows 10; on my Linux laptop I have no such issue...
Sorry to hear you're having trouble with high CPU usage. There's one known issue which has a fix that will come out in the next release. More details here: https://github.com/josh-berry/tab-stash/issues/240#issuecomment-1072004399
If the workaround described there doesn't help, please feel free to open a new issue on GitHub and I'd be happy to take a look.
