Stops working on YouTube sometimes (not sure if this is the only site), but works again after disabling/reenabling.

I'm new first time

After update to 5.0.0 at 102ESR, with RuAdLIst JS Fixes, Yandex maps gave up loading map images. Had to rollback to 4.19.0.

would be better if i didn't have to reinstall it every time i closed firefox or restarted my pc. i only have one script so it's relatively easy to fix, but it's still really annoying and i can't imagine how much worse it'd be if you have several.

TemperMonkey works, but...

It's UI is very unintuitive but I still kept using it for many months daily, it did its job. However, then I encountered a deal-breaking bug, it seems:

Bug: I have two scripts applied to a base URL. After navigating the portal for a while, I ended up with TemperMonkey reporting it applies about 70 scripts. And it apparently did, because loading the pages within the portal became pretty slow.
I then migrated to FireMonkey, which has much more intuitive UI and doesn't exhibit this bug.

I've been a happy user of TM for a while, however the May 2023 update has broken some critical functionality involving cookies. Thankfully I have a backup of the previous version of TM.

// @grant GM_cookie

GM_cookie.list({}, function(cookies, error) {
if (!error) {
// do something useful
} else {
//error = 'not supported' every time since May 2023
console.error(error);
}

Still usefull but it randomly stops working after some times, without error or any message. I need to disable the addon and activate it again to make it work.

a good quote:
If you need compatibility with old scripts your best choice is Greasemonkey. If you need it for modern scripts or to write your own Violentmonkey is fine. Avoid Tampermonkey, they are not to be trusted (proprietary license and analytics)[1].

[1] https://www.reddit.com/r/firefox/comments/6hs59w/tampermonkey_has_google_analytics_enabled_by/

Tampermonkey is pretty good, it's my preferred userscript extension. My only problem with it is that it doesn't work with Firefox containers. Specifically, trying to export the settings to Google/OneDrive/etc. won't work if those sites are set to open in a container; when it opens auth.tampermonkey.net/auth to use OAuth to log into those services, the pages open in the specified Firefox container and Tampermonkey immediately throws an error. I've tried opening TM in the same container, I've tried setting auth.tampermonkey.net/auth to always open in the container, etc. but nothing works. The only option is to export to a ZIP file and carry that file to the destination system. 😕

Hay veces que simplemente deja de funcionar, haciendo que todos los scripts se desactiven de pronto. Entonces, tengo que deshabilitar y volver a habilitar la extensión para que vuelva a aplicar los scripts.