Error:

     Failed to get needed registry information from
     \HKEY_CLASSES_ROOT\http\shell\open

  Before:

     HKEY_CLASSES_ROOT
     |
     +-- http
         |
         +-- shell
             |
             +-- open
                 |
                 +-- command --+-- (Default) = "C:\Program Files\Mozilla
                 |             |                Firefox\firefox.exe" -osint
                 |             |                -url "%1"
                 |             |
                 |             +-- DelegateExecute = {17FE...}
                 |
                 +-- ddeexec ---------- (Default) =

  After:

     HKEY_CLASSES_ROOT
     |
     +-- http
         |
         +-- shell
             |
             +-- open
                 |
                 +-- command --+-- (Default) = "C:\Program Files\Mozilla
                 |             |                Firefox\firefox.exe" -osint
                 |             |                -url "%1"
                 |             |
                 |             +-- DelegateExecute = {17FE...}
                 |
                 +-- ddeexec ---------- (Default) = "%1",,0,0,,,,
                     |
                     +-- Application -- (Default) = Firefox
                     |
                     +-- Topic -------- (Default) = WWW_OpenURL


  Reference:

     https://bugzilla.mozilla.org/show_bug.cgi?id=35308