"Suspicious Activity Might Have been Detected" malware in Safari or other browsers
Here's the solution on iOS/Safari:
- Close Safari
- Open Settings
- Look for the Safari settings, click it
- Click Advanced (at the bottom)
- There is a setting for JavaScript, turn it off
- Close Settings
- Open Safari
- Close the message box if it is still open
- Click on the "show me all the web pages" icon in the lower right (whatever it's called)
- Close the page in question
- Go back to Settings and turn JavaScript back on
All done!
I simply just cleared my history and it went away for me (iPhone user)