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In Linux and some UNIX-like platforms, selecting text will automatically copy the contents of the selection to the clipboard. Mozilla also follows this convention on these platforms. This preference controls that behavior.

Possible values and their effects


Automatically copy contents of selections to the clipboard. (Default in Linux)


Do not auto-copy selections. (Default everywhere else)


  • This preference only has an effect in *nix builds. (See bugs below.) For similar behavior on other platforms, try the AutoCopy extension.

First checked in

2000-06-06 by Charles Manske

Has an effect in

  • Mozilla Suite (all versions since M16)
  • Firefox (all versions)
  • Thunderbird (all versions)
  • SeaMonkey (all versions)

Related bugs

External links