Ridiculous. As I'm writing a review for a product on the site I bought it from, and KNOW it's the cheapest place to get said product, the Invisible Hand tells me I can get it on Amazon for $1.50 more.

I've had this installed for 2 days, and 95% of the places it tells me are on Amazon. I'm getting rid of it right now.

Too few notifications to have any value.

Let me know when they can cover all merchants, not just the biggies.

---JP

that's all we need, yet another bot that watches what you do and uploads statistics.

Invisible Hand is amazing: you forget it's there until you're browsing around for something you might want or need, and then it just pops up and reminds you that the item is cheaper elsewhere, or it confirms that you're getting the best price. Love it!

I really like this add-on, but I just installed the PictureFox add-on to find it breaks InvisibleHand. I wish I didn't have to choose between better product pictures on Amazon vs price comparison. But price comparison wins out....

I really like this add-on, but I just installed the PictureFox add-on to find it breaks InvisibleHand. I wish I didn't have to choose between better product pictures on Amazon vs price comparison. But price comparison wins out....

you can save money using this

This is an extremely useful application, especially if you're trying to squeeze every last cent.

Great Extention Until Last Update VERSION 2.2
Prevents Logining on to OpenDns ?

must role back to ver 2.1

Good addon, but can you give the option to hide the icon in the status bar? It just takes up space.

Findet nicht wirklich den günstigsten Preis in Germany. Da ist man mit Preissuchmaschinen besser dran.

It can get a little annoying, given that it doesn't always give useful information, but that's a give and take with any price comparison service.

I confirm Jerry LeDoux's report of staying logged into sites.

I can narrow it down a bit - I get logged out only upon using the "back" command or button in Firefox. After this happens, hitting refresh gives me the same page, but logged in. Go figure. Sent a note to the developer - hope they can fix, I love this extension and am already missing it.

I had to uninstall this after the latest update. I suddenly had problems staying logged in to sites. Every time I changed pages, I had to log in. The update was the only thing I had installed and it was only happening in Firefox, I uninstalled it and it was the culprit.

I had to uninstall this after the latest update. I suddenly had problems staying logged in to sites. Every time I changed pages, I had to log in. The update was the only thing I had installed and it was only happening in Firefox, I uninstalled it and it was the culprit.

This is a neat little addon for savvy shoppers. Already it has saved me from making a bad purchase decision.

Although I think I have noticed a small issue. I landed on a product page on Amazon and it showed a couple sites with better prices in the "View all offers" dropdown. However, when I went to the lowest offer (eg. from Amazon to TigerDirect) the addon tells me it is even lower somewhere else (eg. Buy.com). I think it should just show them all at once.

Nice little shopping gadget...I like the way it only pops up when your seriously shopping - the rest of the time it's hidden away. Always manages to save me a few quid. Definitely a lazy person’s way of making sure you're getting a good deal without having to trawl around the web - especially if you're speed-shopping like I tend to do!

I like the fact that it only activates when it realises i'm shoppping and apart from that there is just a green arrow in the corner of my screen. It doesn't seem to work on every site but when it is functioning, and you are shopping, it is very useful indeed. I was hoping a tool like this would come along. It really takes the drudgery out of looking for a deal online. Great for saving time and money :)

The add-on is polluting.

Error: Components is not defined
Source file: chrome://canitbecheaper/content/invisiblehand.js
Line: 48
aSubject = aSubject.QueryInterface(Components.interfaces.nsIHttpChannel);

Components is not always available.
It is however always available for aTopic is http-on-examine-response and http-on-modify-request
So, make sure to check for those two first before trying to access Components

It is the best addon I have installed in three years of having firefox. I saved me £100 on a TV and usually £5 whenever I buy a game online

Not entirely convinced with this, seems to only work with Amazon and when I search on one product then change to another it no longer searches. I have to come out of the browser then search again. As per another review if this is not a problem for you then this is a good plugin, however I wont bother with it as it seems to be limited to one web site (Amazon) that it does it comparison searches which to me is not a great idea; I would want it to be able to do this on all the big online stores Play.com, 24/7 Electrical, Empire direct etc etc etc.

Generally seems to work fine, however...

I mostly use play.com and amazon.co.uk (often the best prices/section). It seems that it will compare Play prices to Amazon prices, but not vice versa. I prefer to browse on Amazon, so this means I have to manually check Play prices each time, which kinda defies the point.

Also, I would rather it allowed you to switch off automatic checking and let you just check using the status bar button on demand. I find the automatic checking of each page unnecessary most of the time, and that it slightly slows down browsing.

If the above are not problems for you then this seems like a good tool, and it definitely a good idea. Unfortunately, the way it functions at the moment it isn't for me.

When I installed the plugin it wanted to update and hung up. I dont think it was the plug though as much as my old computer. Works great now.

Is play.com supported as it is shown in the screenshot? But doesn't come up in list of retailers.

Very good add on and very useful.

Does the list of retailers include tech sites such as NewEgg, ZipZoomFly, PriceWatch, etc.?