steps to reproduce: Try installing the add-on https://preview.addons.mozilla.org/en-US/mobile/addon/53633/ All non-Firefox add-on files should be served as attachments (when they are accessed from Firefox)
This is a dupe of another recent bug, I think.
(In reply to comment #1) > This is a dupe of another recent bug, I think. It sounds close to bug 565143, but it's annoyingly different. When you're in Fennec (or Thunderbird, eventually), we want to serve xpis directly. When you're in Firefox looking at /mobile, we want to serve them as attachments for easy downloading.
This also includes accessing Thunderbird add-ons in Firefox STR: 1.Go to https://preview.addons.mozilla.org/en-US/thunderbird/addon/10183/ 2.Click on the "Download Now" button 3.Click on the download button in the pop-up message observed behavior: firefox intercepts and tries to install the add-on.
"Near me" is a mobile add-on.On clicking the "Download Now" button,Firefox intercepts and tries to install it. add-on detail page:https://preview.addons.mozilla.org/en-US/mobile/addon/53633/ To check the supported apps on this add-on: https://preview.addons.mozilla.org/en-US/developers/versions/edit/97716 So bug reported in comment #0 is not fixed.Reopening..
You filed a different bug for mobile. It's a different problem. We treat certain apps as browser apps and serve the files as .xpi. For non-browser apps (that's you, THUNDERBIRD), we serve attachments. Fixing the mobile vs. firefox vs. thunderbird-the-browser is a different issue. This bug fixes the regression from remora.
Thunderbird add-ons get served as Content-Disposition: attachment.verified https://preview.addons.mozilla.org/en-US/thunderbird/addon/246/ https://preview.addons.mozilla.org/en-US/thunderbird/addon/71/ verified