isn't really working right now fort he past coupel cays. no hover buttons, no blocking. may have to modify script again due to google updates

Yes, the script has broken for me since updating to 2.3.4.

It's due to yet-another set of changes to the site by Alphabet-Google. You can tell the r###lts pages look a bit different from a few days ago.

JS, for my setups:

Tampermonkey 5.3.3 / Firefox 128.6.0 ESR (r3dfox)
:: The 'Block' button is not showing. Actual filtering is occurring.

GM v3.1.1 / :ahem: legacy Firefox {yes-yes we know-- you don't support them. Just mentioning for sake of other readers who'll come this way}
:: Neither the 'Manage Hiding' nor 'Block' button are appearing. Filtering is NOT occurring.

And to report in one place, as this is certainly related to Google's changes: Google site: Tool (Site r###lts / Exclude sites) is not working at all on either setup - the tooltip does not pop-up, and hovering & clicking the link goes to the URL i.e. does not pop open the tool's config pane.

Version 2.3.5 has some fixes for missing block buttons on web r###lts. But they might change it again tomorrow. < sigh >