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Firefox Developer Edition shows popup that breaks Selenium script

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  • 1 has this problem
  • Last reply by Standard8

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I'm trying to use Firefox Developer Edition (50.0a2 (2016-08-23)). When it opens, a small popup message appears saying:

 Accessibility support is partially disabled due to
 compatibility issues with new Firefox Developer 
 Edition features.  
    Learn more....

and an OK button.

This popup breaks my Selenium webdriver scripts. How can I turn it off? Search of web says, just restart and it will start in single mode. But this doesn't work from inside the Selenium script. How can I start Firefox Developer in single mode the first time?

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I've just had a dig around in the code. The message is prompted when the browser starts in the new-ish multiprocess mode.

It looks like you can avoid the message by setting the preference "browser.tabs.remote.force-enable" to true using selenium. That will force multiprocess on all the time, which is where Firefox is going, so it will be good for testing.