Not every user of your web application has same settings in the Mozilla Firefox web browser. If some users have JS switched on, some may have switched if off for whatever reasons. In such case, a tester may want to understand the application behavior for several other settings. We want to highlight this address "about:about", try this in your web browser and you will get information to lots of things. The information is like treasure and helps to identify lot of things about your web application under test. Go ahead and explore!

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