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@styen thank you! it seems to be working now!
for reference, I was not able to downgrade chromium but following this guide https://gist.github.com/Thomas-Ln/c4ae803e90f9984b6612c8983c8fde1f I got the libffmpeg.so from the .deb package for version 95.0.4638.69 of chromium-codecs-ffmpeg-extra
I'm using libffmpeg.so from chromium 96 on opera-beta and libffmpeg.so from chromium 95 in opera-stable
@styen I see I have chromium 96 installed, and opera beta is 82
I'll try downgrading chromium to version 95 to see if that fixes the crashes, thanks!
I think it's related to the ffmpeg hack to get videos working on linux (linked in the first comment), but the same libffmpe.so file is being used with opera-beta and it doesn't crash, so I imagine it's something with opera that will get fixed by itself eventually?
@operauserx yes, I tried that option
it's not specific to whatsapp web though, it's a general thing that happens on many websites (twitter -sometimes-, whatsapp web, heroku's website -though not in heroku's dashboard-, reddit -sometimes-, my home banking website, I couldn't find a pattern between all those sites, some has videos, some have service workers, some has none, some work for some time and then crash)
just tried clearing cookies or cache for whatsapp and it didn't fix the problem either
@operauserx thanks, I tried the reset option but it didn't fix the problem, whatsapp web crashes as soon as I open the page
@linuc the only workaround I found so far is to use the opera-beta package for twitter, reddit, whatsapp web, my homebanking app, etc 
spoke too soon, it takes longer but it ends up crashing anyway
looks like the latest 81.0.4196.60 fixed this problem!
I just tried with the opera-beta package and it seems to be working fine, no crashes at all. I guess it's a matter of waiting for a new version.
After the latest update (Version 81.0.4196.54), many tabs crash and after a few crashing tabs Opera closes completely.
I tried opening Opera from a terminal
When Opera closes, this is what I see in the terminal:
Crashing due to FD ownership violation:
#0 0x55b8c56c52f3 <unknown>
#1 0x55b8c57636fc <unknown>
#2 0x55b8c57636c1 <unknown>
#3 0x55b8c7ae1ba5 <unknown>
#4 0x55b8c7ae2f92 <unknown>
#5 0x55b8c7ae2ed2 <unknown>
#6 0x7fc4ae7bb420 <unknown>
Violación de segmento (`core' generado)
Discarded=1
(Violación de segmento means segmentation fault)
Some sites crashes 100% of the times, like Whatsapp web, or my bank's website (www.bbva.com.ar). Some sites crashes most of the times when I interact with videos (like if I hover a video on twitter to show the controls to pause/play it it), but every now and then the controls work (YouTube, never crashed).
I tried in incognito mode in case any extension was causing this but sites keep crashing.
At first I suspected the problem was the libffmpeg.so fix that I have to run after every update that I got from this thread https://forums.opera.com/topic/37539/solving-the-problem-of-the-opera-browser-with-video-playback-in-ubuntu-and-similar-distributions-linux-mint-kde-neon, but websites like whatsapp web crashes immediately so I don't think it's related to videos.
I don't know what to try to debug this.
If it helps: I use Linux Mint 20.2, opera is installed through apt