Remove faviconUrl, show icon in customization box

Relevant issues: #4, #7, #9

Bugfix: Serialize message before delivery

When "permissions": { "cross-domain-content": [ ... ] } is used, the receipt of the message packet would fail ("NS_ERROR_FAILURE: Failure"). This release includes a fix that addresses this issue.

Automatically adapt button size to user's preferences

Fixes #5

Bugfix for Firefox 24 (#3)

Fixed #3.

Improved popup panel handling

• New: The browserAction.onClicked event receives an argument that closely follows the format of Chrome's tab.Tab.
• New: Automatically resize the popup panel when its content changes dynamically.
• New: Unload the popup document when the panel is closed (consistent with Chrome). Previously, the popup was never unloaded after being shown once. If you relied on this incorrect behavior, either update your code, or stick to the previous version.

Dispatch onClicked event with Chrome's tabs.Tab type

Verified with Firefox 22, add-on SDK v1.14 (39467a307f58b63c1907c8d383e48475c98b0624)

0.1.4: Serialize data content, fixes #1

Verified with Firefox 22, add-on SDK v1.14 (39467a307f58b63c1907c8d383e48475c98b0624).