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Quoting spage:

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Hi, when I go to my user page and click [Edit with form] my user page, my Firefox 20 console shows a JavaScript error

  TypeError: setting a property that has only a getter
  newBtnElement[attribute.name] = attribute.value;
adding &debug=1 to the URL shows it's coming from line 198 of https://translatewiki.net/w/extensions/SemanticForms/libs/SF_preview.js

I do get a form with a nifty Google Mapsgadget to set my location, but I think due to this JS error other code stops working, so e.g. [Show preview] doesn't work

Chromium doesn't report this error, but it reports 'SecurityError: DOM Exception 18' and Invalid 'X-Frame-Options' errors.