CircleCI Docker public convenience images with browser variants will see an upgrade to Firefox 56+ and Chrome 59+ on Monday, September 3, 2018. To avoid any changes to the image you’re using please lock your configurations to the sha256 of an image.
The PR to merge this change into our production image is open pending next Monday, September 10th.
Anyone requiring phantomjs and/or older Firefox support should move to the -legacy variant of our images or pin to the specific sha revision of the image. The sha can be found in the UI by expanding the Setup Environment step.