Rated 2 out of 5 stars
As another latest review by user gsingh said, the add-on has great potential, but does not handle some of the most common ways people put local links in company local network pages. The local links which work in IE should work in Firefox. For most of the links in my company intranet, this add-on says "Cannot find link location".This review is for a previous version of the add-on (0.99.25.1-signed).
Thanks for the review. Did you find another addon in the meantime which can serve your purpose better? If not you can file a bug report here with a more detailed description: https://github.com/feinstaub/firefox_addon_local_filesystem_links/issues