Does it work in a new Private Browsing mode window?

Did you check the permissions in "Tools > Page Info > Permissions"?

Any luck with enabling third-party cookies or deleting cookies.sqlite?

I have exactly the same problem, and it does not help with private browsing mode.

Neither does a clean profile with no extensions. The problem also seems be the same regardless of Windows or Linux platform, or 32/64 bit.

Furhermore, the very same build of Firefox 34 that managed to login to Google previously, a few hours ago, does not work anymore. This of course indicates a change in the Google end not compatible with Firefox 34.

However, the following does indeed work, but is more to be seen as a clue to what is going on than a practical workaround:

• clean profile, default settings, start Firefox 31, log in to Google account and exit Firefox without cleaning cookies.
• start Firefox 34 and it will be logged in to the Google account.

That is this bug:

• bug 1059074 - Cannot log in to Google Accounts

Please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html

The workaround is to toggle this pref on the about:config page:

• network.http.spdy.enabled.http2draft = false

Ok the workaround works but now I have to log in every time I close firefox. Use to just be able to check the box keep me logged in and I would not have to log anymore. Did this get broken too?