This method dont need any Extension

1. Ctrl+F to open find.

2. Paste your string.

3. Alt+Enter to select all of the instances of the string on the page.

4. Ctrl+L to broaden the selection to the entire line of each instance on the page.

5. Delete/Backspace to remove those lines.

This method u need this extension

Even its slow but its just an alternative in case u were too lazy to do the 1st method