4a6d51e8d5
When server set Content-type:application/octet-stream to the file there is a chance on some Linux distros that "unknown" file handler is selected to open the file which leads to strange list of application handlers. The logic leads to nsOSHelperAppService::GetFromType where the nsGNOMERegistry::GetFromType is called which could return useless "unknown" handler app. MozReview-Commit-ID: 5RgviXEBUmj