If you are on Firefox, you can set that inside about:config and that should be permanent. In Chromium-based browsers, I don't know how to make that last.
But if you use this site frequently maybe is worth installing an extension for that, which probably has the ability to specify rules on a per-site basis. The only one that I've used before with good results is this one:
It's only for Firefox, though. You should look into other extensions if you are using something else.