It should be made read-only, along with a notification telling the user about this.
Created attachment 820072 [details] [diff] [review] Make Manifest Editor read-only for hosted apps The makes the editor read-only, and swaps out the panel's name to indicate it is read-only. Do we need want something more obvious? I thought about some kind of notification, like the way warnings / errors are displayed, but it seemed like it would be too noisy and might make the user feel sad when they haven't done anything wrong.
Created attachment 820733 [details] [diff] [review] Make Manifest Editor read-only for hosted apps v2 Switches test to use a packaged app, since hosted apps aren't editable anymore. Try push: https://tbpl.mozilla.org/?tree=Try&rev=fb148d52e630