I tried it out 4 times on 3 different pages. Once on a page with links to audio files, then twice on a page with thumbnails and links to pictures plus a single link to a video. (url: https://en.wikipedia.org/wiki/Japonaiserie_(Van_Gogh) Finally once more on another wikipedia page with 2 image links (svg and png) and a handful of images on the page (url: en.wikipedia.org/wiki/Ffdshow). In the first 2 attempts, the counter progressed to about 2/3 of the indicated total, and then ... nothing. In the 3rd attempt (which I did after aborting the 2nd attempt) the counter seemed to start where it had left off, increased somewhat, and then... again nothing. In the final attemp, something similar. The counter started at 0/0 with only images checked. Upon page reload, it went to 261/311 and stayed there. While writing this report, I switched to Google Translate and now the addon actually picked something up: 6 links of mediatype application/json. But I had a checkmark at images only...