title: chrome extension occurs multiple times in Task Manager
body: <p>Sometimes my extension stops working (clicking the browser action doesn't do anything, it stops doing its background activites). I'm debugging that problem.</p>
  
  <p>When it stops working, if I click 'background.html' to open the background page, I get a blank white window instead of the background page (none of the panels open). Reloading the extension from 'chrome://extensions' doesn't allow me to get the background page either. I have to completely quit the browser and restart. If I keep the background page open and then the extension stops working, the JS console doesn't work. I can't use the 'Sources' tab to find out what stack frames are executing etc.</p>
  
  <p>I also noticed that the extension occurs multiple times (multiple adjacent rows) in Google Chrome's own task manager. But I'm unable to select them individually. Clicking one row selects them all.</p>
  
  <p>Anybody seen this before?</p>
  
  <p>Could this occur if my extension code gets into an endless loop? I don't see high CPU usage either at the OS level or in Google Chrome's task manager. Same behavior under both Mac and Linux.</p>
  
  <p>FWIW the extension is relatively complex: it uses web workers, 10s of uploads and downloads in the background page.</p>