After adding the signature file and clicking the "Save" button, the webpage did not respond, and the phenomenon of "fake death" appeared, which was actually caused by the browser.

The solution is as follows: Click "Tools"-select Internet options, open the options, and click "Security".

Will be under the "safe" Internet, local Internet, trusted websites and restricted websites.

Both are selected as "default levels". Refresh the page again after completion, or reopen the page after closing, and it should be ok.

If it still doesn't work, you can use 360 Security Guard to clear the cache, garbage, history, etc. in the browser, and then restart the settings. You can also use other browsers to set the signature file.