First, I will say that this is, in general, the best pop-up dictionary I have used and I've tried out several of them. The interface is clean and intuitive, everything functions quickly and smoothly, and especially after I switched to the GIT version as I saw recommended in multiple threads in this forum there were far less bugs and glitches than your rivals like stardict. While GD doesn't automatically scan the words from every application or website I have tried it on, so that a simple mouse-hover brings up the popup, it does work for far more of them than stardict seems to. And even when using the copy-to-clipboard method it is quick and painless.
Unfortunately, I am still forced to use stardict for my popup dictionary needs, despite being inferior in nearly every way, because it has one function that is far to useful to me to give up: saving lookups (from both the popup and main window screens), in whole or in part, in an on-going text file. This makes it very easy to add those words to my flashcard program for further study. While GD does have the option to save articles from the main window as individual, html files, there doesnt seem to be an option to to select only part of the article to save, nor does it create an on-running file with all your saves stored together for easy perusal. However, this would still be sufficient IF it was possible to also save articles from the popup window.
I love GoldenDict, you've made an excellent application that is a joy to use. Hopefully it will soon meet my needs so I can make the switch to it permanent.