Data collecting has been implemented in the Firefox Trunk version, and in future official releases, this feature will be turned off by default. Users can activate it through the menu, after which the system will periodically send the user's browsing characteristics to the server so that developers can analyze the data, identify software issues, and ultimately improve the browser. There is a dedicated page on the Mozilla wiki explaining this issue. The potentially collected data currently mentioned includes browser usage rates, interface arrangement habits, cache effectiveness (such as forward and back usage), memory usage, etc. Additionally, hardware and software configurations of the machine may also be collected to help troubleshoot problems. Friends who are concerned about privacy, if you want to turn on this feature, please carefully read the explanation on the wiki (which is still being updated). The earliest release that may include this feature is Firefox 2 alpha2. If you have any objections, you can also go to the discussion page of the wiki to voice your protest.