HorlogeSkynet/thunderbird-user.js
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Page: 3.2 Proton Mail Bridge Users
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1.1 Overview 1.2 Backing Up 1.3 Implementation 1.4 Troubleshooting 2.1 Multiple Profiles 2.2 Multiple Profiles [Thunderbird Portable] 2.3 Concurrent Profiles 3.1 OAuth2 Users 3.2 Proton Mail Bridge Users 4.1 Extensions 4.1.1 Calendar 4.1.2 Markdown Here 4.1.3 uBlock Origin 4.1.4 CardBook 5.1 Miscellaneous 5.1.1 Thunderbird Android Home
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3.2 Proton Mail Bridge Users
Samuel FORESTIER edited this page 2025-01-11 19:21:01 +00:00
Table of Contents

About Proton Mail Bridge integration

thunderbird user.js enforces certificate strict PKP (Public Key Pinning) verification. This breaks software performing MITM (such as a local antivirus), or even Proton Mail Bridge.

When connecting Thunderbird for the first time to Proton Mail Bridge, this hardening measure (1223) must be relaxed :

  • security.cert_pinning.enforcement_level to 1

Once incoming/outgoing servers enrollment is done, you may switch back to template value :

  • security.cert_pinning.enforcement_level to 2