Since the release of Firefox 32, Mozilla starts checking all files downloaded against Google’s application reputation database via the service Chrome Safe Browsing feature, as does the browser Chrome.
Checking the downloaded files is carried out in the version of Firefox 31, which was released yesterday, but yet it uses a local list. In the next version (6 weeks) Mozilla will go to use the service from Google. For each downloaded file will be calculated hash SHA-256, which is sent for review by Google, along with other information (URL, file size in bytes).
Theoretically, this function is to improve the safety of users, but in practice it does not look so smooth. Currently the service is different Chrome Safe Browsing false positives. For example, he said “malicious” distribution of the popular torrent client uTorrent.
Therefore, many Firefox users may find it prudent to turn off unnecessary checking of downloaded files. Moreover, not everyone will want to share this confidential information from the company.
To disable the function, type the command about: config in the address bar, and then to find among the settings optionbrowser.safebrowsing.appRepURL and disable it by double-clicking.
Alternatively, it is possible to completely disable the Safe Browsing in the browser. To do this, type about: preferences in the address bar to switch to a tab with the security settings and disable the option «Block reported attack sites» and «Block reported web forgeries» («block websites suspected of attacks” and “Block sites suspected of fraud “).