[Bug 1153043] [NEW] .do cannot be modified via Firefox

[YannUbuntu]

Public bug reported:

https://www.formulaires.modernisation.gouv.fr/gf/cerfa_12100.do is a form from the French government.
When I open it normally from the government website, it opens by default in Firefox, displays correctly, but it cannot be modified.

To fill in it, I need to workaround by saving the file (right-click ->
save link target as) on my disk, then open it in Evince. From inside
Evince, it can be modified correctly.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  https://www.formulaires.modernisation.gouv.fr/gf/cerfa_12100.do is a form from the French government.
  When I open it normally from the government website, it opens by default in Firefox, displays correctly, but it cannot be modified.
  
  To fill in it, I need to workaround by saving the file (right-click ->
- save link target as) on my disk, then open it in Evince.
+ save link target as) on my disk, then open it in Evince. From inside
+ Evince, it can be modified correctly.

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https://bugs.launchpad.net/bugs/1153043

Title:
  .do cannot be modified via Firefox

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