The first checks for updates and downloads them if available, the second checks a site you are about to visit online against the most recent database.Mozilla notes that existing Google cookies may be sent in the second case.

If it cannot identify a file using the local list, it queries Google's Safe Browsing service by sending metadata to get a verdict on the download.

You may disable this feature on the about:config page by setting browser.Rep URL to a blank value.: Mozilla maintains a blocklist that lists malicious extensions as well as extensions that cause issues in the browser, for instance by consuming a lot of memory or causing stability issues.

Manually Updating Firefox Configuring Automatic Updates Reinstalling Firefox Community Q&A Firefox is normally configured to update automatically in the background, so that you don’t need to worry about keeping up to date.

If these settings have changed, however, you may be wondering how to update the program.

First connections initiated by the user of the browser, for instance when an url is entered into the address bar of the browser or when a link is clicked on, and then automatic connections for a variety of reasons.

Some power browser updates, other may retrieve certificates or verify if a page is malicious or not.Mozilla maintains Firefox ESR Releases for approximately one year.Developers and users still relying on the Java plugin technology in the 32-bit Mozilla Firefox web browser should consider migrating to a different solution.Only Mozilla Firefox 52 ESR 32-bit release will continue offering support for the standards-based plugin support technology required to launch Java Applets.To see if you are using an ESR release, check the Firefox menu item (Help - About) and looking for the "ESR" identifier.Older versions of the Java Deployment Toolkit (DT) and the Java Plugin have been disabled by Firefox.