STR: 1. navigate to "about:config" 2. set "devtools.inspector.showAllAnonymousContent" to "true" 3. navigate to any page (the default "about:home" is fine) 4. Open the DevTools Inspector. 5. Check at the end of the markup view, you will see: <div class="moz-custom-content-container"> <div class="highlighter-container box-model"></div> </div> That's the box model highlighter 6. Open a new Tab (cmd / ctrl + t) 7. Drag the previous tab (the one with the inspector active) to create a new browser window 8. Open the Devtools Inspector again Actual Result: The <div> "moz-custom-content-container" now contains two box model highlighter (one is hidden) Expected Result: Only one box model highlighter markup is present. It should be only one box model highlighter markup.
A quick fix it would be probably destroy the highlighter instead of hiding when the "pagehide" event is emitted – some highlighter are doing that already.
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