Google has recently announced the roll out of a plan that will aim to reduce the amount of insecure files that users might download. Users will soon see warnings from Chrome when attempting to download 'insecure' files.
The announcement was made in a recent Google Blog post by a security developer for Chrome. "Today we’re announcing that Chrome will gradually ensure that secure (HTTPS) pages only download secure files...". "...we’ll start blocking "mixed content downloads" (non-HTTPS downloads started on secure pages)."
The Chrome team has defined a download insecure when any of the subresources are non-HTTPS. "Insecurely-downloaded files are a risk to users' security and privacy. For instance, insecurely-downloaded programs can be swapped out for malware by attackers, and eavesdroppers can read users' insecurely-downloaded bank statements. To address these risks, we plan to eventually remove support for insecure downloads in Chrome."
The full timeline for this change can be found below: