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Selenium WebDriver and Firefox 47

Tue 14 Jun 2016

With the release of Firefox 47, the extension based version FirefoxDriver is no longer working. There was a change in Firefox that when Selenium started the browser it caused it to crash. It has been fixed but there is a process to get this to release which is slow (to make sure we don't break anything else) so hopefully this version is due for release next week or so.

This does not mean that your tests need to stop working entirely as there are options to keep them working.

Marionette

Firstly, you can use Marionette, the Mozilla version of FirefoxDriver to drive Firefox. This has been in Firefox since about 24 as we, slowly working against Mozilla priorities, getting it up to Selenium level. Currently Marionette is passing ~85% of the Selenium test suite.

I have written up some documentation on how to use Marionette on MDN

I am not expecting everything to work but below is a quick list that I know doesn't work.

  • No support for self-signed certificates
  • No support for actions
  • No support logging endpoint
  • I am sure there are other things we don't remember

It would be great if we could raise bugs.

Firefox 45 ESR or Firefox 46

If you don't want to worry about Marionette, the other option is to downgrade to Firefox 45, preferably the ESR as it won't update to 47 and will update in about 6-9 months time to Firefox 52 when you will need to use Marionette.

Marionette will be turned on by default from Selenium 3, which is currently being worked on by the Selenium community. Ideally when Firefox 52 comes around you will just update to Selenium 3 and, fingers crossed, all works as planned.

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