I ended up having one profile configuration file and a keyboard shortcut that toggled between two different symbolic links, plus a Gnome extension to display the currently selected profile in the top bar, so I would use one profile during the work hours and another one during the evening, but it was slow, difficult to export to other computers and just messy altogether.
So now I'm using Firefox containers and I'm mostly happy with them. I wish the bookmarks bar would change depending on the currently selected tab however.
The good news is that you probably don't need 99.99. Read "Embracing Risk": https://sre.google/sre-book/embracing-risk/
Well „need“ of course it a bit ambiguous. „It would make our life substantially easier if we had 99.99%“ would pretty much summarize it :)
Use Alfred; I've been using it for years (10 maybe?) -- solves this problem and is extremely useful in general
1. Find your DNS Target in heroku. It should end with .herokudns.com
2. Lookup the historical DNS record to get the IP addresses. You can find historical DNS records here: https://securitytrails.com/dns-trails
3. Replace your CNAME record in your DNS provider with A records that point to the IP addresses you just found.
Your site should come back up shortly. We plan to revert back to CNAME records once Heroku gets their DNS issues sorted.