Mozilla Began to apply new method Identification of browser installations. In distributed From the official site of assembly supplied in the form of EXE files for the platform Windows, the identifiers dltoken unique for each download. Accordingly, committed sequentially several downloads of the installation archive for the same platform leads to downloading files with different checksums, since the identifiers are added directly to the download file.
The effect manifests itself only when the EXE files are loaded from the Windows environment. When you try to download from the browser or from the command line in Linux EXE files are always given the same. Archives in non-executable formats also do not change. It is argued that it is necessary to disable this behavior through the shutdown of telemetry in the browser, but it is not clear how the control of telemetry in Firefox will help with the first installation and will be able to influence the data substitution on the server through the download files from the site (the problem is manifested including when loading from Google Chrome). As a workaround to obtain Firefox installation files without identificors, you can initiate the download directly from the site ftp.mozilla.org .
As the reason for embedding the DLToken identifier, it is a desire to associate the first settings available to telemetry and Google Analytics identifiers with actual browser loads. In particular, it is possible to estimate the reasons for deviations in the number of downloads and installations, and understand which installations are caused by those or other downloads (for example, it is possible to find out that one downloaded file was used to install multiple browser instances, which explains why too many installations have been fixed in the day not corresponding to the number of downloads).