Furigana Maker wót aiktb

Features:
1. By default, furigana is automatically added to many common Japanese websites, such as Twitter, Asahi, Wikipedia etc.
2. The list of rules used by Auto Mode can be customized using CSS selectors and domains.
3. Users can use their mouse to select areas on any web page to add furigana to.
4. N5 kanji filter prepared for JLPT learners, these kanji will not be added furigana.
5. The font size and color of furigana can be freely modified, and toggle the display of furigana.
6. Optional support for hover mode, only showing furigana when mouseover kanji.

Note:
*Custom user rules require the use of CSS selectors.*
*Note that program cannot guarantee completely correct word segmentation and kanji pronunciation.*
This extension code is open source on [Github](https://github.com/aiktb/FuriganaMaker).