I posit: high enough that you’re slightly overoptimistic about stuff you can’t control, so that for stuff where confidence itself makes the difference, you squeak in.
FWIW, see Notes on Optimism, Hope, and Trust for more on this hypothesis, including William James’s speculations.
In Firefox, you can hover over the timestamp next to the name of the commenter, right-click (or whatever it is you Mac people do), and select Bookmark Link… to bookmark a comment.
Alternatively, you can click on the timestamp and then use whatever mechanism your OS/Browser allows to bookmark the page you go to as a result of the click.