Woraround for #7

Init the directory in another folder than extension folder :
.thunderbird/xxx.default/mintrayr_data_DO_NOT_TRY_THIS_AT_HOME/
-> allows decompression in a folder not monitored by the XPIInstall service
that on some configurations instantly deletes the content of any folder
created by the addon in the profile 'extensions' folder (See #7)
-> This folder will not be deleted during the uninstall process of the addon; DO NOT TRY THIS AT HOME