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Thunderbird add-on login issue.

Thunderbird Passwords and sign in
Anthony Vasquez
Anthony Vasquez

Mozilla Account works normally directly inside Firefox, but logging into Mozilla Accounts through Thunderbird's Add-ons manager fails during the Firefox handoff.

Steps to reproduce: 1. In Thunderbird Add-ons, click Log in. 2. Thunderbird redirects to Firefox, showing "Continue with Mozilla account". 3. Click Continue -> Firefox displays "You could not be logged in. Please try again."

Troubleshooting already tried:

  • Created a brand-new Thunderbird profile (thunderbird -P) — same failure occurs.
  • Cleared cookies/site data in Thunderbird and cleared Firefox cache.
  • Disconnected existing Thunderbird/Add-ons connections from Mozilla Account dashboard.
  • Extensions and add-ons themselves install and download normally.
Mozilla Account works normally directly inside Firefox, but logging into Mozilla Accounts through Thunderbird's Add-ons manager fails during the Firefox handoff. Steps to reproduce: 1. In Thunderbird Add-ons, click Log in. 2. Thunderbird redirects to Firefox, showing "Continue with Mozilla account". 3. Click Continue -> Firefox displays "You could not be logged in. Please try again." Troubleshooting already tried: * Created a brand-new Thunderbird profile (thunderbird -P) — same failure occurs. * Cleared cookies/site data in Thunderbird and cleared Firefox cache. * Disconnected existing Thunderbird/Add-ons connections from Mozilla Account dashboard. * Extensions and add-ons themselves install and download normally.
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