Firefox 54 has not released yet. How did you get it? Also, always try to troubleshoot with Safe Mode: https://support.mozilla.org/kb/troubleshoot-firefox-issues-using-safe-mode
Understand, I am on beta channel. I got a ff54 not labeled beta this morning (ca. 10:00 CEST). What does this mean?
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0 Build ID: 20170615030208 I can't reproduce this issue using the latest Nightly 56 or the latest Firefox 54 release (Build ID: 20170608105825) on Windows 10. Frank, are you still seeing this issue? Did you had the chance to try to reproduce this issue in Safe Mode?
OK, I am not on that machine/in that environment right now (it was also hit by the limited number of requests via proxy earlier). So, no news here and inspecting my schedule I do not know, when I get there again.
This works for me and I haven't seen any other reports about the Google notifications on Firefox 54.