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[stfischr <stfspam@xxxxxx>]

Ah, I didn't think of this solution. But if the folder gets deleted, how
does he keep the permissions of files inside while I locked it with
chattr?

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https://bugs.launchpad.net/bugs/1415744

Title:
  Firefox changes Files that are owned by root and read only

Status in firefox package in Ubuntu:
  Invalid

Bug description:
  Hello.

  I'm running Ubuntu 14.04.1 LTS (actually Xubuntu 64 Bit) with Firefox
  35.0+build3-0ubuntu0.14.04.2 .

  While trying to lock my symbol panel, I gave the file
  .mozilla/firefox/61pbl108.default/xulstore.json to root and took all
  write rights.

  -r-------- 1 root root 270 Jan 29 00:29
  .mozilla/firefox/61pbl108.default/xulstore.json

  But when closing Fireox, it changes those rights back to:

  -rw------- 1 stfischr stfischr 270 Jan 29 00:29
  .mozilla/firefox/61pbl108.default/xulstore.json

  Even when I use sudo chattr +i it still writes to the file, but
  doesn't change owner and rights anymore. How is that even possible? I
  verified firefox is running as normal user and I'm also logged in as
  normal user.

  This is a serius security issue, a programm running as user that is
  able to write into files belonging to root!

  Any ideas on this one?

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