#5667 Decrypt messages in Thunderbird

[sosnovsky]

This PR added message decryption and its necessary UI improvements on Thunderbird email client.

close #5667

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Tests (delete all except exactly one):

• Difficult to test (cannot find a reliable way to perform tests in a Thunderbird mail environment)

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
2422507	Triggered	Generic Password	f901bc5	extension/chrome/elements/compose.ts	View secret
2422507	Triggered	Generic Password	1f56012	extension/chrome/elements/compose.ts	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secrets safely. Learn here the best practices.
3. Revoke and rotate these secrets.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[sosnovsky]

Hi @martgil, I created updated PR with scripts injection based on your initial #5796, seems to work well. Can you please check it too, thanks!

[martgil]

Works well. Thanks for your help @sosnovsky for finalizing this PR reaching its completion.

[martgil]

This where dynamic content script injection comes in place. It's actually the best solution that I can't implement - its a great inclusion where we don't actually need to bundle the entire js libs and dependencies.

[martgil]

Hi @sosnovsky - I think we can merge this one now. thank you!

[sosnovsky]

Hello @martgil, I've added some code simplifications, can you please re-check, thanks!

[martgil]

Still works well after the code refactor. Thank you!