1. It's fine for 1 star or whatever. I made this extension to read books and articals on the internet easier. Just want to share with other people who need it, just like me.

2. You can adjust "Skip Text" and "Skip Words" in the options to your liking. Set them to lowest values will apply styling for all text. Please read the "Help" tab for more information.

If you don't mind, please post links to those websites here, so I can make further investigation.

This extension will simply replace a normal text with a block of text. It will not break any web page, unless there are some scripts running on the background to check the content and modify them again. For example, duckduckgo.com will track your mouse movement and keep replacing the text in the search result if you modify them.

3. I added TEXTAREA to the ignore list in the latest version (1.6.1+). Hope this will fix the issue in your case.