Gotta say, I love this add-on. I use it with F1000, F1000 for references and this for LaTeX and cross-referencing my tables and figures.
Honestly, just being able to caption the figures is a huge bonus.
There ARE a few hiccups, such as directly editing on the caption once you've already made it (click the caption, click 'change' and edit it there) and figures not appearing the in C-ref list if they're not 'in-line' with the text, but these are super easy and simple fixes and have not caused any annoyance other than the 15 seconds to discover it the first time.
Of all the add-ons I have, this is legitimately the most useful one that has directly positively impacted my ease of writing.
Cudos for the great app!