Thanks for this important work which also included a better option panel. You still managed to easily reuse FF's search engines. The elements are now individualized, which opens up new perspectives for future development:
1-Sizing icons according to their importance
2-Adding additional layers to icons such as the arrow at the bottom left of Windows shortcut to differentiate identical elements: between wikipedia of different languages, we would annotate their language code for example.

Other suggestions:
3-The right mouse button should be reactive also in the bubble
4-The bubble should be formatted freely in css.
5- A timer to automatically clears the bubble
About the right-button menu:
6-The three mouse buttons should be as reactives as in the bubble.
7-Should be inspired by the Quick Context Search add-on