197 reviews
  • 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.
    Please accept my apologies for any issue with logging out on version 2.0. I hope it hasn't caused too much inconvenience. We're going to be deploying a new version later today which should resolve the issue. In the mean time time, we've rolled-back to the previous version of InvisibleHand (1.8.2) which is definitely reliable.
  • 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.
    I'm sorry this happened. This is due to a bug in version 2.0 that I didn't catch during testing. Please replace InvisibleHand with the current public version and it will solve the problem.

    Evgeny
  • 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.?
  • I think you should add support to Canadian stores/sites.

    But anyway it's really seful for those who live in the US or UK
  • Sounds extremely useful, but it needs support for more countries. I'm in Denmark, so this is not really useful for me - yet. But it is a truly great idea.
  • Many thanks for this money saving add-on. Works very well for me and have already saved a few quid. Excellent...



  • Surprised that there is no option. It doesn't work for me. Maybe it is because I am in Canada but in the case that I am on the US site, it again doesn't show anything. However it could be extremely useful.
  • Waiting for Canada Support!
  • Sit's in the background until you need it. Saves you money. It's a no brainer download!
  • Fantastic add-on, works in the background and is completely unobtrusive. You forget it's there until you buy something on-line. It saved me £51 on a Sony E-reader!
  • I'm all up for using anything that can save me a few quid and it quotes up to the minute prices. Love it!
  • Fantastic add-on, works in the background and is completely unobtrusive. You forget it's there until you buy something on-line. It saved me £51 on a Sony E-reader!