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Double spacing on reply e-mails

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I have version 45.0 on my PC, but every time I reply to an e-mail I get a double space between the lines. I know I have the option to not compose message I'm HTML format, but this is not acceptable to me. On my Laptop I have version 38.7.2 and in this version I can use HTML format when replying to e-mails without getting a double space when pressing enter. Is there a way to change this setting, and if not, how can I downgrade my 45.0 version to the 38.7.2 version?

I have version 45.0 on my PC, but every time I reply to an e-mail I get a double space between the lines. I know I have the option to not compose message I'm HTML format, but this is not acceptable to me. On my Laptop I have version 38.7.2 and in this version I can use HTML format when replying to e-mails without getting a double space when pressing enter. Is there a way to change this setting, and if not, how can I downgrade my 45.0 version to the 38.7.2 version?

All Replies (1)

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Please read the release notes for the new version. https://www.mozilla.org/en-US/thunderbird/45.0/releasenotes/