change innerHTML into innerText
use content script instead of background script. finally don't bother to write tons of '\'s.
this is a broken version. i got it wrong. i commit it just to roll back to a earlier version.
Revert "this is a broken version. i got it wrong. i commit it just to roll back to a earlier version."

This reverts commit 5bfd029f3a1b754a80a71a7c9daa7ffb34a0d725.
Revert "use content script instead of background script. finally don't bother to write tons of '\'s."

This reverts commit 4e93bded5e29c587b9834b620fbe024ec944ba56.
working version. properly using content script to replace old method. finally got gid of tons of '\'s.