Great addon. I've been looking for a good speed dial addon quite a while and been testing many. This one is my fav so far.

Pros:
+ Most important: privacy is respected. The addon doesn't track usage nor does it send info about website usage to third-party services what is a must for such a tool.
+ The author tries to use as little rights as needed to make the addon work and he clearly explains the rights in the addon's description.
+ Thumbnails are loaded locally, it's even possible to use local graphic/logo files, i.e. no online connection needed.

Cons:
- Cutomising the look and feel, in particular size, of the dials is not yet possible
- Creating thumbnails from public library often doesn't show results. Maybe another service could be used here (like e.g. https://logo.clearbit.com)