Explain xkcd: It's 'cause you're dumb.
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As of October 2016 the footnote/tiny print at the bottom of pages reads: is best viewed with Netscape Navigator 4.0 or below on a Pentium 3±1 emulated
in Javascript on an Apple IIGS at a screen resolution of 1024x1. Please enable your ad blockers, disable high-heat drying,
and remove your device from Airplane Mode and set it to Boat Mode. For security reasons, please leave caps lock on while browsing.

The text gives questionable advice on how to view Using a discontinued browser on an Apple computer released in 1986 with a screen resolution one pixel tall would be extremely difficult.

Netscape Navigator 4.0 or below It is normal to specified browser and minimum version, as all later versions typically retain needed features from previous versions. Instead, the footnote claims that older versions are better (perhaps due to reliance on a bug fixed after version 4.0). No version of Netscape Navigator is currently maintained.
on a Pentium 3±1 Pentium was a brand of processors made by Intel. Instead of specifying just a minimum or maximum version, both are specified, in a syntax more often used for specifying tolerances, usually of a physical property.
emulated in Javascript Javascript is a programming language used on web pages. While may be possible to write a Pentium emulator in Javascript, this would be an unusual and probably inefficient choice.
on an Apple IIGS The Apple IIGS was a computer made in the 1980's. Even the slower of Pentium computers are hundreds of times faster than the Apple IIGS. Combined with the inefficiencies of processor emulation, this would result in a painfully slow experience, if it worked at all.

The Apple IIGS was made before Internet connections were common, and there was probably no web Javascript-compatible browser for it, if any browser at all. There are now Ethernet cards available for the IIGS.

at a screen resolution of 1024x1. If the dimensions given are in pixels, as they usually are, then the recommended display setting would only show one horizontal line. 1024 pixels is wider than the maximum supported display width of the Apple IIGS.
Please enable your ad blockers, Many sites ask users to disable ad blockers, either so the owner can get ad revenue, or because blockers sometimes inadvertently block other parts of the page.
disable high-heat drying, This appears to be referring to clothes dryer heat settings, which are irrelevant to websites. Some clothing is damaged if dried with high heat.
and remove your device from Airplane Mode and set it to Boat Mode. Many portable devices, especially cell phones and tablets, have an "Airplane Mode," which disables the wireless radios to avoid potentially interfering with an aircraft's operation while flying. "Boat Mode" is fictional. (Though it might be nice to have a boat mode that turns the phone off if dropped, to reduce water damage.)
For security reasons, please leave caps lock on while browsing. Having caps lock on would not improve security. It may reduce your security if it prevents you from using lower-case letters in passwords.

This footnote was added October 4th or 5th, 2016 [1].

[edit] Old footnote

Previously the footnote was:

We did not invent the algorithm.
The algorithm consistently finds Jesus.
The algorithm killed Jeeves. 
The algorithm is banned in China.
The algorithm is from Jersey.
The algorithm constantly finds Jesus.

And the following one added by Randall:

This is not the algorithm. This is close.

It was added by Randall in April 2007, according to his Blog as a response to random billboards appearing in the New York, Los Angeles and San Francisco areas. It turned out these were a viral marketing campaign by the ask(jeeves) search engine to drive publicity around their new search algorithm. The campaign is long over, but Randall kept the text there (apparently) as a self referential advertising campaign. Specifically, people who find the small text will use a search engine to see what it means and the search engine will likely lead them back to xkcd — where they saw the text initially.

BTC means bitcoin. The string of alphanumeric characters is his bitcoin address.

It was removed on September 9th, 2016 [2].

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