Why has my e-mail started double spacing lines? I want single space
All of a sudden today (4/30/16) when I write my e-mails, it double spaces lines. I do not want this! I see that many others have this problem. Like them, I am not a techie. I'm 83, and I want my single spacing back! How can you do this to me?
Выбранное решение
The Thunderbird composition window now functions more like a word processor in that pressing the "Enter" key inserts a new paragraph, pressing "Shift+Enter" inserts a new line.
This new behavior can be switched off as follows:
At the top right of the Thunderbird window, click the menu button 
> Options > Composition > General tab.
Uncheck 'When using paragraph format, the Enter key creates a new paragraph'.
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Выбранное решение
The Thunderbird composition window now functions more like a word processor in that pressing the "Enter" key inserts a new paragraph, pressing "Shift+Enter" inserts a new line.
This new behavior can be switched off as follows:
At the top right of the Thunderbird window, click the menu button > Options > Composition > General tab.
Uncheck 'When using paragraph format, the Enter key creates a new paragraph'.
Thank you! At first I couldn't find the menu button because on the e-mail it didn't look like the icon shown on this page. Once I got that sorted out, it all is now solved. Again, thank you! (Sometimes I do wonder why tech companies make things so difficult for non-techie users. I would never have found this answer by myself.)