[pdkl95]

per-HTTP request

Nothing ever guaranteed the user agent header would be consistent or present. Any re-use of a user-agent string adds bits of data that can be used for tracking.

[nitrogen]

While we're at it, we need some solution to tracking based on browser window size. I'm one of the few people I know who doesn't maximize everything, so I'm probably 100% uniquely trackable just by window size.

[quesera]

Window size detection is done with JavaScript. Block it.

[JupiterMoon]

It can apparently be done with CSS by a determined website.

[jakeogh]

Disable JS by default. I do, and it makes the web better. Surf/tabbed makes this easy to do per process.