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Mozilla Thunderbird as a website
Mozilla thunderbird as a website would be more conveinent at times then starting an app or leaving it on idle so that is uses up your resources in the background.
Open pdf or download in browser
When you click on a pdf or similar file it opens in the browser without the need to dowload it and then open it in the browser.
Re: Thunderbird Web, I'd pay a sub fee for it.
I had a similar idea, except thunderbird web(email) is free, seeing as how the thunderbird app is free, and everything is transferred onto the web, or however Mozilla wants to do it.