Firefox add-on works with “jpm run”, but not whith .xpi file generated with “jpm xpi”

Question

I\'m using the Firefox Add-on SDK to develop a Firefox add-on. I have followed the Getting Started tutorial.

Firefox version : 41.0.2
My Process is :

Answer 1

As you have determined, if you desire your Firefox Add-on SDK add-on to work in Private Browsing mode you need to have add the key private-browsing with a value of true in your package.json file.

If you are using no other permissions, you could add a line to your package.json file that looks like:

"permissions": {"private-browsing": true}

The Firefox documentation on writing SDK add-ons for private browsing mode specifically states that the require("sdk/private-browsing").isPrivate() method will return true when any of the following is the case (emphasis mine):

• a private window, or
• a tab belonging to a private window, or
• a worker that's associated with a document hosted in a private window
• any window, tab, or worker if the browser has been configured to never remember history (Options->Privacy->History)

If you do not have "private-browsing": true, then, as the documentation states, the following will be the case (emphasis mine):

• the windows module will not list any private browser windows, generate any events for private browser windows, or let the add-on open any private browser windows
• the tabs module will not list any tabs that belong to private browser windows, and the add-on won't receive any events for such tabs
• any ui components will not be displayed in private browser windows
• any menus or menu items created using the context-menu will not be shown in context menus that belong to private browser windows
• the page-mod module will not attach content scripts to documents belonging to private browser windows
• any panel objects will not be shown if the active window is a private browser window
• the selection module will not include any selections made in private browser windows

The net effect will be that your add-on will appear to not work when the profile you are using is configured to never remember history without having the "private-browsing": true permission in your package.json.

If you do put that permission in your package.json file, you must use the private-browsing module, require("sdk/private-browsing").isPrivate(object), to check for being in a private window or tab. If you are in such a window or tab you need to not store any information about such environment.