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Why do I receive a script error when trying to execute the Developer Console?

Knowledge Article Number 000205278
Description When I'm trying to open the Developer Console it freezes the browser and, depending on the browser, we can see the following error:

"A script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue."
Resolution The solution would be to reset the IDEWorkspace for the affected user. To do this, please:

1. Open the Developer Console as the affected user.
2. When the error appears, please the "Debug Script" button. If you don't have a "Debug Script" button you'll have to open the Browser's Developer Tools manually (please scroll down to the bottom of this Article for additional information).
3. Move to the 'Network" tab of the browser's Dev Tools.
4. You'll find a number of requests, if you don't, please refresh the browser. We're interested in a request with the following format:

User-added image

5. The 'Id' value is the one we are looking for. Please copy that.
6. Open Workbench. Select "Utilities" and then "REST Explorer".
7. Do a GET request for "/services/data/v29.0/tooling/sobjects/IDEWorkspace/1deQ00000004HmJIAU" - remember to replace the "1deQ00000004HmJIAU" parameter with the "Id" relevant to your org that you obtained in step #5.
8. You will see the content of the affected user's IDEWorkspace.

User-added image

9. Do a DELETE request.
10. Re-open Developer Console

After following these steps the Menus should be available again and the error message should no longer appear.

Browser's Developer Tools additional information.
- Chrome
- Firefox
- Internet Explorer

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