Recently, I found that, I cannot open “.mht” file directly using Firefox. Previously, once I installed Mozilla Archive Format, there is no problem to open .mht file. But now, I just drag and drop a .mht file, it will pop up the “Open with…” dialog. Very incovenient. So I search for the solution from internet. However, I cannot find anything.
Lastly, I go to Mozilla Addons website to search any plugin that can edit MIME. Because I read the forum, they said it is because of the problem of MIME. So I found a plugin, MIME Edit. Yes, using the plugin, I can edit the file type for the Firefox. So, I change the “maf” (Mozilla Archive Format) related data, to “open using default application”. Then, problem solved.