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...extension called Taboo - "the cure for tabitis"

You're not being very clear. What do you need those languages for exactly?

To work on the page, the xpath thingy is amazingly strong, for example (http://greasemonkey.mozdev.org/authoring.html).
And AJAX is quite fun, with the xmlhttpRequest method.
Did you see SVG for making 'living' scriptable images? http://overstimulate.com/projects/canvas/

I cannot imagine PHP has much value on the userside, especially with security in mind.
Check this project though:http://www.moztips.com/wiki/index.pcgi?page =XulPhpMySQL

And they are even working on an amazing copy of the Web Developer Toolbar for Internet Explorer, and some sort of GreaseMonkey userscript tool.

Well the best reason is of course to look cool and impress your family at birthday parties. A good second is MS-bashing, always fun.

For me, I love Firefox because
  - I can start typing in a page and FIND things
  - I can easily write userscripts for Greasemonkey to improve websites. For example on a forum I can keep my personal blacklist, reorder the page, detect trolls easily, etc.
  - a very very easy search engine chooser built-in.
  - a very clean RSS checker extension (Sage) without the need of nasty things.

As a developer:
  - it actually gives meaningful errors, contrary to IE.

As a geek:
  - the wonderful new toy called Scalar Vector Graphics (SVG), check out the amazing 'living; images at http://overstimulate.com/projects/canvas/

What is Book Burro? It knows about many popular book sites on the web, and does a comparison shop between all of them, offering you a tiny on-screen pop-down way to find the cheapest price.

But that's if you're cheap, and don't want to support slashdot with your referral dollars. Personally, I like giving referrer dollars to whoever actually deserves them. Perhaps not at double the cost, but I like shopping through sites I frequent whenever possible.

So many things point to Amazon that it seems like a lot of hassle to buy anywhere else, but it's not.

Get yourself a copy of Book Burro; it will automatically annotate any Amazon page you go to with a list of other bookstores you can buy the book at, as well as the prices (often lower than Amazon).

Get a copy of the Book Burro Greasemonkey script for Firefox.

What does it do? All those Amazon links people put on their web pages still work, and you can still use Amazon product search. But it will give you a price comparison right in the browser (a little floating window on top of the Amazon page), together with links to order from other on-line book sellers.

There are other Greasemonkey user scripts that look up the book in your local library and do all sorts of other nice price comparison things for you.

Yeah, You can actually build a game on top of google maps too:

Google Tanks or as we like to call it: GANK - our Railsday entry.

On Railsday (a 24 hour ruby on rails competition), myself and a couple of pals built a "Ajax" powered game on top of google maps. I'm not going to put a live link to it. (each client does xmlhttprequests to the server for status ASAP, and I don't want my poor server to die)

See Britt's write up and my (Jesse's) write up, Rails Day SVN source for all the projects.

Then using that I was able to build Geo-comments into my rails based blog with a couple hours work... When leaving a comment, you leaving your zip code, and then the geo-comments view using embedded google maps to show who has said what

On Railsday (a 24 hour ruby on rails competition), myself and a couple of pals built a "Ajax" powered game on top of google maps. I'm not going to put a live link to it. (each client does xmlhttprequests to the server for status ASAP, and I don't want my poor server to die)

See Britt's write up and my (Jesse's) write up, Rails Day SVN source for all the projects.

Then using that I was able to build Geo-comments into my rails based blog with a couple hours work... When leaving a comment, you leaving your zip code, and then the geo-comments view using embedded google maps to show who has said what

Thats cool.

Britt & I (Jesse) are in Lexington, KY and participated!

I know a Louisville guy in rails, we should do a get rails meetup!

Greasemonkey can cause mozilla to eat 100% when the running a script that is badly coded.

When I developed book burro, I frequently caused firefox to hit 100% and had to kill my browser.

An infinite loop in javascript will kill your browser (although firefox is good at eventually asking if you want to terminate the script since it is taking so long (30 seconds or so).
So, yes, you can get these issues with greasemonkey, but it is more than likely an issue with a specific userscript, not greasemonkey itself.

Check out Book Burro which lets you see the book prices from other sites. It uses xmlHttpRequest to grab the prices. Amazon wrote about it on their web services blog

Another cool script if you are traveling and very flexible is Expedia Expanded Search.

And if you like non-DRMed MP3, Amazon has them. You can download them faster (skipping intermediate pages) using Amazon Free Music Helper.

Check out Book Burro which lets you see the book prices from other sites. It uses xmlHttpRequest to grab the prices. Amazon wrote about it on their web services blog

Another cool script if you are traveling and very flexible is Expedia Expanded Search.

And if you like non-DRMed MP3, Amazon has them. You can download them faster (skipping intermediate pages) using Amazon Free Music Helper.

Check out Book Burro which lets you see the book prices from other sites. It uses xmlHttpRequest to grab the prices. Amazon wrote about it on their web services blog

Another cool script if you are traveling and very flexible is Expedia Expanded Search.

And if you like non-DRMed MP3, Amazon has them. You can download them faster (skipping intermediate pages) using Amazon Free Music Helper.

This is really cool, since it will allow the Javascript SVG library I wrote to work without the adobe plugin!

Javascript SVG Sparklines