#1281·thorium

Remove/Bypass Chrome Web Store proof enforcement in Developer Mode.

Author: NelyonnCreated Aug 25, 2026Updated Aug 25, 2026

Is your feature request related to a problem? Please describe. I am trying to install .crx extensions from outside Google's web store, and even in developer mode, Thorium rejects the file with CRX_REQUIRED_PROOF_MISSING.

I prefer clarifying beforehand, that this does not concern the --extension-content-verification flag (and similar), it concerns the UI path (which is most practical as well). I've tested this behavior on Thorium 151.0.7922.72, and on the following operating systems:

  • Windows 10 21H2 LTSC,
  • Windows 11 23H2.

Describe the solution you'd like, including relevant patches or source The solution could include, but may be changed to better fit the project's needs:

  1. An optional UI switch allowing to disable this behavior,
  2. Bypass (or removal) of this proof check in developer mode only.

I am open to further ideas on improving this proposal.

Did you read the FAQ? https://thorium.rocks/faq Yes, I did.