[Bug 490935] Re: it is not possible to modify email subject

[tellapu]

I could download and activate the legacy WebExtension version of the add-on Header Tools Lite and it worked on TB 68.4.1:
https://addons.thunderbird.net/en-US/thunderbird/addon/headertools-lite/

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https://bugs.launchpad.net/bugs/490935

Title:
  it is not possible to modify email subject

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