Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have been using RestClient on OSX's firefox browser. All of sudden I have noticed the address-bar of the Firefox. Please see the indication in the image.

enter image description here

I want to know the reason for this & how to resolve it to normal ?

share|improve this question

XML User Interface Language (XUL) is used for building (among other things) Mozilla's apps and add-ons/extensions, and locally running XUL apps are sometimes referred to as chrome (the word can also be used to refer to UI/window elements such as window frames, menus, toolbars and scroll bars).

There are a whole bunch of default chrome:// URLs defined for various Mozilla apps; you can check out the list here.

What was the URL shown before the change? As per the screenshots on the official add-on page (see one of them below), the chrome:// URL seems to be pretty much the same as in your image above. Does the RESTClient add-on still work properly? If so, why worry?

enter image description here

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.