Spam advertising on the Forum.

I don't have an iPad, but it probably has a strippo version of Safari. The Android version of Chrome (and the native browser) don't support extensions. Firefox on Android does, though!

You can still get rid of pop-ups and spam by setting up a proxy filter for your iPad, but that's pretty technical.

For technically minded people: you can set up Privoxy and Squid on a dedicated unix/linux/bsd server, chain them together and point the proxy settings on your iPad to your server (protocol should be SOCKS5). Privoxy is capable of downloading AdBlock blocklists with a script. I did this for a while on Android before Firefox was usable. There is probably some way to do the equivalent with Windows, but I have no idea how.

Unfortunately, that is the only ad blocking solution that I know of that doesn't require browser support.

I don't feel guilty about blocking ads, because not in a million years would I buy anything they're selling. So the only difference is that I am less aggravated, especially because my Internet connection is an atrocity that drops packets constantly, and this leaves it with tons of broken JavaScript and style sheets. Lots of ads make this a million times worse.