[tbb-bugs] #21719 [Applications/Tor Browser]: Can't copy (Ctrl+C) and make search (Ctrl+F) by formulae on feynmanlectures.caltech.edu. FF 18.0.2 works fine

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#21719: Can't copy (Ctrl+C) and make search (Ctrl+F) by formulae on
feynmanlectures.caltech.edu. FF 18.0.2 works fine
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 Reporter:  Ilya_SpongeBob            |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-usability             |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by gk):

 Replying to [comment:4 Ilya_SpongeBob]:
 > Replying to [comment:2 gk]:
 > > Hm, and this works in a vanilla Firefox 45 ESR?
 > This works in Mozilla Firefox ESR, Portable Edition 17.0.3 and Mozilla
 Firefox ESR, Portable Edition 45.1.0
 >
 >
 https://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20Portable%20Ed./Mozilla%20Firefox%20ESR%2C%20Portable%20Edition%2017.0.3/
 >
 >
 https://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20Portable%20Ed./Mozilla%20Firefox%20ESR%2C%20Portable%20Edition%2045.1.0/

 This seems to work for me immediately after loading the page: I can copy
 and paste formulae and search for them in the text. But later on something
 changes the content (probably some script) leading to the results you
 describe. Can you reproduce that? And taking that into account your normal
 Firefox still allows you to copy formulae after that change on the side?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21719#comment:5>
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