Features:
- Now shows a popup before initiating the dictionary database. So users are aware of the loading time.

Changes:
- Increased the speed dramatically*
- Now finds up to 20 characters per page**

Thanks to a helpful user, I've updated the add-on.

Technical:
- Now uses mostly ECMA6 javascript. Requires Firefox 52 and upwards. Recommending Firefox Quantum.
* Changed from localstorage to indexedDB and increased the amount of entries in the db, while reducing the searches on the database.
** It will try to find 20, but it might not find all 20 in our database.

Decreased the size of the database by removing unnecessary entries. This will improve the speed, as they removed items amounted up to several thousands. These entries consisted of Chinese names, city names etc. Words not useful for learning.