Dump and repack the stylish plugin database in order to use your own editor/ide for the CSS styles or to make sharing/exporting your styles even easier.
Default location for firefox is at ~/.mozilla/firefox/*.default/stylish.sqlite
Default location for chrome is at ~/.config/google-chrome/Default/databases/chrome-extension_fjnbnpbmkenffdnngjfgmeleoegfcffe_0/*
Check out the wiki here!