Not meaningfully. A tampermonkey script has complete access to the information in a webpage it runs in. This is necessary for its operation and not something I have a problem with, but I'd never say its an improvement in terms of security.
I don't know about chrome, but Firefox also allows automatic updates to be disabled on a per-extension basis.
I'm a fan of userscripts but lets not pretend they're magically better.
For example Firefox can't even control on which websites the extensions run. This is stupid and bad. Tampermonkey just does this thing right too.
Edge at least has an allowlist, if I'm not mistaken.
E.g. here's the "bypass paywalls" extension requesting permission to inject content scripts into particular domains sites: https://github.com/iamadamdev/bypass-paywalls-chrome/blob/c6...
Not meaningfully. A tampermonkey script has complete access to the information in a webpage it runs in. This is necessary for its operation and not something I have a problem with, but I'd never say its an improvement in terms of security.