MacOS – Can’t find untested extension in order to remove it: SafariTabSwitching

It's primarily a matter of parsing the output of defaults read ~/Library/Safari/Extensions/extensions and formatting it in a user-friendly way. The result actually answers both of your questions:

defaults read ~/Library/Safari/Extensions/extensions | awk '
/Bundle Directory/ {
    split($0, t, /\"/);
    sub(".safariextension", "", t[4]);
    sub("-1", "", t[4]);
    bundle=t[4]
    e="disabled"
}
/Enabled/ {
    e="enabled";
}
/Hidden Bars/ {
    print bundle, "...", e
}' | sort --ignore-case

Creating a shell script out of it is left as an exercise to the reader.

Please note that this will most probably stop to work if Apple decides to change the format of ~/Library/Safari/Extensions/extensions

They have changed your Proxy settings.

Proxy is a way to connect to Internet true a specific gate (server).

Doing that the Track Me is hidden from others since they now do not know who you are.

To fix that Open the Proxy settings in Safari and unchecked anything in the pop up window.

Then Reset the Safari.