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Bookmarklets create history entries which can then appear in the Location Bar’s autocomplete dropdown. To prevent this, the Location Bar will filter out any URL starting with “javascript:”. This option is toggleable via this preference.

Possible values and their effects


Filter out “javascript:” URLs from appearing in the Location Bar autocomplete dropdown. (Default)


Allow “javascript:” URLs to appear in the dropdown.

First checked in

2008-02-23 by Edward Lee

Has an effect in

  • Firefox (nightly builds since 2008-02-23)

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