- You have to click on "ALL" or "THIS SITE" button (on top of the GUI) to enable bionic reading style. I disabled them on default because I don't like the intrusive way of using a new extension.
- Use "DYNAMIC" button to enable dynamic loading of bionic style. This will reduce memory usage by A LOT on web pages with a huge amount of text. However, you may see the text changing as you scroll down or up too fast.

For more information, please read the "Help" tab.

Update:
- I have released a new version with bug fix for websites that use "contenteditable" attribute in text editor.
- Thanks for reporting this bug. I have never used this extension outside of reading books and articals... my bad :D!