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Requiring the extension to be on (Linux only)

Chromium based browsers​

  1. Turn on developer mode on the chrome:///extensions page

  2. In the extensions page, click pack extension. Then select the directory of mandatorytask. manifest.json should be contained in that directory as mentioned under "installation". This will create a mandatorytask.crx file. Remember the location of this file.

  3. Find the location of the packed extension in your file manager or use file:///. Then drag and drop the mandatorytask.crx file into the extensions page, clicking "allow" to install the extension.

  4. Click details and copy the ID of the extension

  5. Open a terminal with root access. Create the file test.json (or any name you want, must end in .json) in /etc/chromium-browser/policies/managed/ or similar depending on your browser. It's /etc/brave/policies/managed/ for Brave and /etc/opt/chrome/policies/managed for Google Chrome. Search "how to set [insert browser name] policy on linux" and you should get the location.

  6. In the test.json file, insert {"ExtensionInstallForcelist": ["insert-extension-id-from-step-4"]}. See https://chromeenterprise.google/policies/#ExtensionInstallForcelist. Note the square brackets! You can also add "BrowserAddPersonEnabled": false, "BrowserGuestModeEnabled": false and "IncognitoModeAvailability": 1 for additional layers of preventing workarounds. Note the options you provide are listed around two curly braces {} and are in format "key": value for each option with commas between two options.

So if you combine all 4 options listed here, the test.json file will look like this:

{"ExtensionInstallForcelist": ["insert-extension-id-from-step-4"], "BrowserAddPersonEnabled": false, "BrowserGuestModeEnabled": false, "IncognitoModeAvailability": 1}