⚠️ Before reporting a problem with chromium, enable developer mode in Tampermonkey

[lethak]

⚠️ All browser impacted (but non chromium Firefox)

To enable Tampermonkey's developer mode due to the Manifest V3 changes in Chrome-based browsers, follow these steps. Manifest V3, introduced by Google, imposes stricter security rules, requiring developer mode for certain Tampermonkey versions to run userscripts

Manifest V3 restricts extensions, impacting how Tampermonkey injects userscripts. Developer mode is required to use the UserScripts API.

Steps

• In your Chrome-based browser (e.g., Chrome, Edge, Brave), click the three-dot menu in the top-right corner.
• Navigate to More Tools > Extensions. Alternatively, type chrome://extensions/ in the address bar and press Enter.
• On the Extensions page, locate the Developer mode toggle in the top-right corner

After enabling developer mode, Tampermonkey should run userscripts without issues.

If you see a persistent warning about enabling developer mode (as reported in some cases, e.g., Vivaldi 7.4), it might be a bug—try reinstalling Tampermonkey or switching to the stable version from the Chrome Web Store.

Anyway...