Follow these steps to disable SIP: Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup. Launch Terminal from the Utilities menu. Type in the following command and hit Enter: csrutil disable Now you can reboot your machine and empty the Trash. Remember to enable SIP again following the exact same steps, just with a different command csrutil enabl Reboot your machine again and you are good to go on your merry way.
One way the images could be extracted from the .webarchive file is through the Terminal app. Here's how.1 - Press Command and space to launch Spotlight, type in "Terminal" and hit Enter. That'll open the Terminal app.2 - Type in this command without hitting Enter. Note there is a space at the end after "html". textutil -convert html3 - Drag the .webarchive file into Terminal. Hit Enter and you'll find all the extracted files in the same folder where the .webarchive file is located.