How to workaround «This extension was turned off because it's no longer supported» in Google Chrome 139 for extensions based on Manifest V2?

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Step 1

Type temporary-unexpire-flags-m in chrome://flags.
2025-08-08--21-49-48

Step 2

Enable the flags

  • #temporary-unexpire-flags-m137 («Temporarily unexpire M137 flags»).
  • #temporary-unexpire-flags-m1387 («Temporarily unexpire M138 flags»).

Step 3

Relaunch Chrome.

Step 4

Implement the solution for Chrome 138.