Lately I noticed that Street view has became very sluggish in Firefox. I can also no longer "zoom out", back to the map level. I already tried stuff like deleting cache and cookies, but to no avail.
A new firefox profile did not help either. I even reverted to older versions of FF, but got the same slow result.
On this same computer however, Streetview is fast and snappy in Chromium 65.
This computer runs Slackware-current x64. Any ideas ? Is Google boycotting Mozilla ?

David

I think it's Google boycotting Mozilla, a similar thing happens also with YouTube that loads slower in firefox.
I really hope it's not the case anyway, it would be a really sad thing.

I hope not, I'd rather assume that some weeks ago they provided a new version with optimizations that the web engine needs to "understand" to implement them.

I observed a similar difference using news.google.com in Firefox vs Chromium, for instance it takes more time to change the country and language in Firefox than in Chromium. That's since the layout of the website has been modified.

At the moment I use Chromium 68 and Firefox 52.9.0.

I can't say that I've observed either problem on Firefox, but I have experienced on YouTube poorly formatted pages on Firefox. When there are elements on the left of the page, the page displays too wide and the video falls off the right edge of the screen. I usually fall back on using Vivaldi for YouTube when this happens, as it has not exhibited that behavior.

This problem seems restricted to the new Firefox Quantum versions, not the older v. 52-ESR version that I'm using right now. However, it has not been a consistent problem.

I've been struggling myself with this issue for a few months now, and only used Firefox ESR, tried Quantum and experienced the same behavior.
Youtube, LinkedIn and some other sites that have some newly developed active layout adaptive engines are the worse, almost killing a quad-core i7 under Firefox.
If I open several tabs with youtube (open in new tab from the first page), the additional tabs are getting almost uncontrollable until the layout "settles" down.
I'm pretty aggravated by this situation as I started to consider an alternative to Firefox and anything google-coded is not an option for me.
Worth mentioning that I observed this Firefox behavior also on other systems I own and I'm happy learning now from this thread that it's not something I'm particularly affected by.