Add Thunderbird support

[martgil]

• [x] #5747
• [x] #5665
• [x] #5666
• [x] #5667
• [ ] #5668

• [ ] #5669

  Reference: https://github.com/FlowCrypt/flowcrypt-web/issues/1640

[martgil]

Hi @tomholub cc: @sosnovsky, what would be our prioritization for these tasks?

[sosnovsky]

Hi @tomholub cc: @sosnovsky, what would be our prioritization for these tasks?

Current order looks correct - we should start with checking possibility of detection thunderbird environment and replacing email elements in it. And if it works then we can add encrypted compose button and implement decryption of encrypted messages.

[sosnovsky]

I'm just not sure that it's possible to replace Thunderbird UI elements from extensions, but worth checking - earlier we even didn't expect that FlowCrypt works well as Thunderbird extension :)

[martgil]

Current order looks correct - we should start with checking possibility of detection thunderbird environment and replacing email elements in it. And if it works then we can add encrypted compose button and implement decryption of encrypted messages.

Thanks, Roma. Copy!

I'm just not sure that it's possible to replace Thunderbird UI elements from extensions, but worth checking

Right! During my initial engagement with checking its UI elements, some parts of it look native and don't resemble a webpage. I will check thoroughly to establish a concrete foundation and update you on everything. If the UI elements are not changeable, then we might need to consider another plan for improvements.

[sosnovsky]

@martgil maybe this guide will be useful - https://developer.thunderbird.net/add-ons/mailextensions/supported-ui-elements, it lists possible elements to interact with Thunderbird UI