Scrabulizer Importer Firefox Extension
Scrabulizer Importer v1.1.0
Click the above link using Firefox to start installing the plugin. If a yellow bar appears at the top of the window then click 'Allow' to accept the plugin. A dialog will appear where you'll need to click the 'Install' button. Restart Firefox to complete the installation when prompted.
That's it! Now when you go to Lexulous or Wordscraper in Facebook, the new "import into scrabulizer" link will appear.
Scrabulizer and this extension remain free, but donations towards development and hosting costs are always appreciated.