The add-on doesn't fully work, and for as far as it does, is not very practical.
- I type in a regex and do 'search' but it doesn't always show the results it should. Oftenly it shows nothing in the result box, sometimes just one result where there are many more.
- The highlight function does find all matches. However, it would be nice if the page could jump to the first/next result, but that's probably what the search button is supposed to do.
- When using the highlight function without the 'global' flag, a result is that is not the first one may be highlighted, rather a random(?) one.
- It seems that this addon looks for matches in the html source code rather than the actual page. Therefore it also seems to match classnames, image paths etc. This is not great and the highlight function therefore has matches that can't be seen on the page!

It's a nice add-on, but could use some improvement!