For me, references don't work at all. Nothing reacts. I don't have opera installed.

The setting icon works only when the plugin is checked, turned on, otherwise it is ignored. Does it help you?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Two suggestions.

First, when nothing is typed, show unfiltered words list instead of useless "Words list".

Second, add a good way to scroll through long list (at least, stylus friendly, but maybe, finger friendly), so that a word could be scrolled to without typing anything.

Like six buttons nearby the list:
___
| |fast up
|___|
|__|medium speed up
|_|precise up
_
|_|precise down
|__|medium speed down
| |
|___|fast down
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
I frequently see formatting problems in articles. Like:

color="blue">n.

beginning of the line too far on the left and cannot be seen

article not displayed at all, though the word is in the list; just blank article viewer; as if it tried to open the article and couldn't;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~

In terminal, the following error is frequently printed (overwhelming the terminal):
QFSFileEngine:: open: No file name specified

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~

If possible, make the program less resource hungry. It heats the device somewhat.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~

Thanks for making the program.