---------------How to pack as extension file-----------
For Ubuntu users:
1. Go to the root of extension folder using command prompt.
2. Use the command "zip -r pandorafms_firefox_extension.xpi ./" without double quotation(" ") marks.
3. Make sure the root folder of the compressed folder contains the chrome.manifest, install.rdf files.
For other operating system users:
Use any of the compressing mechanism and compress the extension folder to .xpi format and make sure the chrome.manifest, install.rdf files located in the root directory of the compressed folder.