applications

"gecko": {
  "id": "addon@example.com",
  "strict_min_version": "42.0",
  "strict_max_version": "50.*",
  "update_url": "https://example.com/updates.json"
}

The applications key contains keys that are specific to a particular host application.

Currently this contains just one key, gecko, which may contain four string attributes:

• id is the extension ID. Optional from Firefox 48, mandatory before Firefox 48. See WebExtensions and the Add-on ID to see when you need to specify an add-on ID.
• strict_min_version: minimum version of Gecko to support. Versions containing a "*" are not valid in this field. Defaults to "42a1". Requires Gecko 45
• strict_max_version: maximum version of Gecko to support. Defaults to "*". Requires Gecko 45
• update_url is a link to an add-on update manifest. Note that the link must begin with "https". Requires Gecko 45

Chrome incompatibilities

You can't use this key in Chrome extensions.

Examples

Example with all possible keys.

"applications": {
  "gecko": {
    "id": "addon@example.com",
    "strict_min_version": "42.0",
    "strict_max_version": "50.*",
    "update_url": "https://example.com/updates.json"
  }
}