Test Case for Mutation Breakpoints

Jan Odvarko, odvarko@gmail.com

This test is intended to verify Break On Mutate support within the HTML panel. This features allows to debug mutation events (DOMAttrModified, DOMCharacterDataModified, DOMNodeInserted, DOMNodeRemoved)

  1. Open Firebug and select the HTML panel.
  2. Expand body element
  3. Right-click on the content element (it's the green h3 'Test Element')
  4. Step by step pick:
  5. Use button below to fire appropriate changes and check that Firebug always breaks at the proper location.

Test Element



Make sure extensions.firebug.filterSystemURLs preference is set to true. If not, set it and reload the page.