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Created attachment 1178360 [details]
HTML code to test the mail display

Description of problem:
we have a mail where someone copy/pasted text from maybe
another mail. some text is not shown in the mail. Looking at the html code
for the mail, the text that is not shown is embedded in ~190 <div> tags.
That means it is opening ~190 <div> tags , than the text is entered, and at
the end it closes the ~190 div tags again. the text in between the div tags
is not shown.

Version-Release number of selected component (if applicable):
Firefox (all current version including ESR and macOS + RHEL)

Steps to Reproduce:
1. Insert the HTML code of the attached html file into a mail (I used Thunderbird to add the HTML code)
2. send it to a GMail address
3. check the mail in Google Mail

Actual results:
Mail text after "Hi" and before "Kindest Regards" is not displayed in Firefox (all current versions and all major OSs)

Expected results:
Mail text should display

Additional info:
The mail is displayed correctly in Chrome, Chromium, Safari and IE

Should be fixed in firefox-45.3.0-1.el7_2