pc2.mypreferences.com - site is not usable

[EricKerby]

URL: https://pc2.mypreferences.com/Comcast/OptDown/opt-down/#/

Browser / Version: Firefox 63.0
Operating System: Mac OS X 10.13
Tested Another Browser: Yes

Problem type: Site is not usable
Description: After entering an email address, the unsubscribe link does not work. It throws this error in the console: "TypeError: "ga.getAll is not a function"". The link in question worked properly in Chrome v.69.0.3497.100.
Steps to Reproduce:
Clicked an unsubscribe link in an email and was taken to this page. Provided the generic entry URL so my email address is not included in this report.

Browser Configuration

• mixed active content blocked: false
• buildID: 20180920135444
• tracking content blocked: false
• gfx.webrender.blob-images: true
• gfx.webrender.all: false
• mixed passive content blocked: false
• gfx.webrender.enabled: false
• image.mem.shared: true
• channel: beta

From webcompat.com with ❤️

[softvision-oana-arbuzov]

Thanks for the report @EricKerby , I was able to reproduce the issue while Tracking Protection Basic was enabled.

Tested with:
Browser / Version: Firefox Nightly 64.0a1 (2018-09-23)
Operating System: Windows 10 Pro, MacOS 10.13.6

Workaround: Disabling "Tracking Protection" the preferences can be changed.

Created Bugzilla issue #1493602.