You can't since that page isn't written by yourself. It's part of the browser identification when it goes online. What are you really asking about here?

''<p>markwarner22 [[#answer-1712540|said]]</p>'' <blockquote>You can't since that page isn't written by yourself. It's part of the browser identification when it goes online. What are you really asking about here? </blockquote> The about:mozilla is part of the Firefox web browser and you can access this offline. ''<p>Yevhen [[#question-1493682|said]]</p>'' <blockquote>I just would like to know if it's possible somehow to remove '''about:mozilla''' page from within a browser (it's important for me). If anyone knows of a way to do it - please let me know. </blockquote> I think there may be a way to block about: urls from loading or being viewable in Firefox though I have not seen discussions about doing this for so long to recall how. All about: urls that are in the Firefox version you have can be viewed on about:about Careful the about:robots have a plan