@thelinuxEXP
It might seem obvious, but anyone who offers web browser software, their *browser* has access to the data fetched by requests and anything typed into a form, included files attached to POST data for upload, any bookmarks you create, and the history.
Not surprised if after all the fuss it turns out Mozilla legal decided (for some reason) they needed explicitly state this, and other browser makers merely assume you implicitly accept it when you install or update a browser.