My god, I just realized one of the simplest opsec things you can do (something I've been doing for years and don't even think about anymore) is set your browsers to open links in private/secure instances AS A DEFAULT.
If it needs to be opened in a window that you want to keep open or bookmark, you can always manually copy and paste it.
It makes no sense to be using a secure shared tool like cryptpad, if you're just gonna open it where you're logged in as you.
Remember the #SocialEngineering motto:
If there are people, there are security holes.
@futuresprog @Gigi Wasn't sure I'd want or trust the Google link-checking feature as below:
"On December 20, 2018, Mozilla announced that Firefox Focus now checks all URLs against the Google Safe Browsing service to help prevent people from accessing fraudulent sites."