Can you make Gmail show plain text only messages in fixed-width font?

Question

Is it possible to make Gmail display messages with only text/plain content using a constant width font? To clarify, I'd still prefer multipart/alternative messages with an HTML part to be shown in HTML mode. (In other words, just like Thunderbird does it.)

I receive some plain text messages with table-like formatting, which obviously depends on constant-width font. Gmail breaks the formatting like this:

I would want something like this, of course:

(Showing messages matching a certain filter (or tagged with certain label) in fixed width would be an equally good solution here, so if that's possible, please let me know!)

I looked around Gmail settings, but couldn't easily find anything related. The "Show original" option is a work-around, but it's rather clumsy if you always have to do that.

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This is a repost of an old (unresolved) Super User question (Google cache). I would have rather migrated it to Webapps, but that's not possible as it seems delete-happy SU moderators have recently removed it altogether for some reason.

Answer 1

If you are using Chrome, the Gmail Fixed Width Text extension takes care of it:

https://chrome.google.com/extensions/detail/gamfbnidfgeeahogblblgafgpdhdkmib

Answer 2

Next you can choose "Reply" or "Forward" and change Font to Courier New.

Answer 3

Ok, you have to try Gmail Fixed Font userscript — http://userscripts.org/scripts/show/17869

Answer 4

You can try Show original in right dropdown list (from ▼ right to Reply in message box header).