Tampermonkey isn't better than using a Chrome extension, but it's less friction for a developer to build and distribute a cross browser script. If they build it as an extension, they need to target multiple browsers and get it deployed to the Firefox/Chrome web store.
If you can read JS and the user script is not huge, I think it makes a huge difference.
Apart from that, there are APIs exclusive to extensions, e.g. instrumenting client-side communication among tabs with different origins, listing all tabs, basically accessing a special API that sits on a higher-level context, and, while gating certain functionality behind user approval, and forbidding other functionality completely (at least in Manifest 3.0), extensions with the corresponding permissions can do more than a script running in the page context. They can inject these as well, though, even overriding CSP sometimes, as far as I know?
The main problem with these permissions, and WebExtension 3.0 partly was an attempt to improve this, or at least claims it: most people give a second of doubt at best when installing an extension, as long as they think it comes from a trusted source.
I love userscripts. Aren't we all using https://github.com/violentmonkey/violentmonkey now though?
thought I realize "if it works it works", https://github.com/Tampermonkey/tampermonkey
I did something similar 2 days ago with ViolentMonkey if you only want to check high-level discussion without any new tabs at all.
https://greasyfork.s3.us-east-2.amazonaws.com/sokzpb2ztmatlh... (screenshot)
https://greasyfork.org/en/scripts/588721-hacker-news-comment...
I'd improve it by counting top level comments next to items but that would slow it down. Still need to make some slight changes like closing sidebar by re-clicking orange (beyond just right-clicking sidebar.)
It's very fast and speeds up thinking overall.
Not on Safari, but I should migrate on Firefox I’ve read (some controversy).
Haven’t seen that before.