ยินดีต้อนรับสู่ส่วนเสริม Thunderbird
Add extra features and styles to make Thunderbird your own.
ปิดReview for HTML Source Editor by boslior
Rated 5 out of 5 stars
Nice and helpful extension, simple to use if you know html+css. 
It will be even better If the developer will add "save and close" button and alert if content is not saved
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