@Jazmac Ahhh, sorry. I was thinking about a completely different problem altogether.
Okay, I just tried logging into Amazon.com from an international Amazon account... I was able to see "Today's Deals"... the other missing items showed up when I maximized the window or put Vivaldi into full-screen mode.
I went full screen, something I almost never do with any browser and the links were there. Now when I size the Vivaldi, the links are there as normal. Good this wasn't something more serious. Thanks for the assist.
@internet Sorry, i do not know what went wrong. I am only a helper not a internal dev.
I thought you may have edited a theme and such change may have been causing the whitish page. I misunderstood you, i am not a native english speaking person.
I am using contrast setting (having and bad ) in Settings → Appearance
so i may not get such low contrast in a theme.
Gwen-Dragon's advice worked for me! I went to the first github link (above), copied the latest-proprietary-media.sh script to a local directory and executed it from my account (not root) with no problems. After re-starting Vivaldi and checking the link where the test videos live (you get a reminder with the link when the script completes) the sites that had not worked for me before do now.
Thanks, I installed libffmpeg-vivaldi and now all testing videos load and play and also I don't need to refresh frame to load the embedded videos on forums etc.
I tried to download this package before from aur but was failed to build. I just found an alternative repository and I download and install it from there.