The above didn't work for me because as far as I can tell if you're using Xdebug the only debug bookmarklets you get is start/stop and debug this page. I don't see any bookmarklet specific to stopping on first line, and neither the start/stop bookmarklets nor stopping PHPStorm from listening within PHPStorm fixed the problem for me.
To get it to stop I did this (on OS X):
- Go to Preferences > Languages & Frameworks > PHP > Debug
- Uncheck both of the 'force break at the first line...' options
- Apply and close
- In the Run menu, uncheck 'Break at the first line in PHP scripts'
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