Add Dropbox JavaScript API as submodule.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
Implement basic layout of Firefox extension.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
Rename directory.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
Implement Makefile and add some files into .gitignore.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
Minor refactory.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
Fix typo in README.

Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>