Here is the complimentary extension that works in conjunction with the RSS Ticker. And what a coincidence! Its on the same web site.
The OPML extension does just what it says: It adds OPML support to the "Manage Bookmarks..." option under Bookmarks. When in the Bookmarks Manager, click File/Import and you'll see Bookmarks and OPML file.
If the author can merge these two extensions together or at least add the import OPML feature to the RSS Ticker extension and save the bookmarks to the Live Bookmarks section, the RSS Ticker extension would be complete.
Overall, this extension adds functionality that should already exist in Firefox. This was something that went completely under my radar and I was totally unaware of. I am grateful for this extension because I've used it multiple times already in a couple of projects I'm working on.
This week, the extension gets a 5/5 for functionality because it does one simple thing and it does it well. Nice work!