[mv3] chrome.userScripts is unavailable/undefined

[derjanb]

Describe the bug
Tampermonkey BETA 5.2.* (mv3 extension) is not working

To Reproduce

Install Tampermonkey BETA [1], which is a manifest v3 extension. Observe the service worker throwing the error
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'configureWorld')

Expected behavior
No error

Workaround
Load Tampermonkey BETA 5.1.6194 (mv2 extension)

Smartphone:

• Android Version 13
• Kiwi Browser Version 124.0.6327.4

Additional context

It looks like the userScripts API is not available to mv3 extensions (Developer Mode is enabled).
If debugging into the service worker, then you can see that chrome.userScripts return undefined, while it should throw an error if developer mode is disabled or provide the userScripts API (Chrome 120+) implementation.

[1]
https://chromewebstore.google.com/detail/tampermonkey-beta/gcalenpjmijncebpfijmoaglllgpjagf
https://data.tampermonkey.net/tampermonkey_beta.crx

[RayKoopa]

For the current workaround, how would one prevent Tampermonkey from automatically updating to the mv3 version that is broken in Kiwi?

[derjanb]

In the meantime you can use Tampermonkey Legacy.