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Web Developer Version History

3 versions

Be careful with old versions!

These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.

Version 2.0.1 1.1 MiB Works with Firefox for Android 48.0 and later, Firefox 48.0 and later

A patch release that fixes the extension opening a new tab every time Firefox starts.

Version 1.2.13 1020.5 KiB Works with Firefox 3.6 - 56.*, SeaMonkey 2.0 - 2.48.*

  • Fixed issues:
    • 'Edit CSS' did not display stylesheet names correctly

Version 1.1.9.1-signed 404.0 KiB Works with Firefox 1.0 - 3.6.*, SeaMonkey 1.0 - 2.0.*


  • Added support for Firefox 4.0
  • Set the 'Expires' value one day into the future by default for the 'Add Cookie...' feature
  • Fixed issues:
    • 'Outline Images With Adjusted Dimensons' did not work with sizes with units specified
    • 'Show Hidden Elements' did not show hidden form elements
    • 'View Style Information' was vulnerable to a cross site scripting attack
    • Z-index used for features which added elements to the page needed to be increased