extension ExtPose

SPOF-O-Matic (delisted)

CRX id


Description from extension meta

Detects likely third-party single points of failure as you browse and allows you to Simulate 3rd party resources being unavailable.

Image from store SPOF-O-Matic
Description from store Updates in 0.8: - Create a WebPagetest comparison video directly from the SPOF-O-matic results Updates in 0.7: - Improved detection for domains with 3-tiers to the TLD (*.co.uk for example) Updates in 0.6: - Fixed black-holing of font stylesheets Updates in 0.5: - Added support for detecting external css files for fonts - Fixed URL parsing to detect more cases Description: Detects likely third-party single points of failure as you browse and allows you to Simulate 3rd party resources being unavailable so you can see what the impact would be on sites. To enable content blocking, click the greyed-out black hole icon in the toolbar. As you browse the icon in the toolbar will display a warning icon if you are on a site that is likely to have problems loading third-party content. If you click on the icon it will display the list of suspect resources as well as how much of the page content they block (resources closer to the top of the page will have more of a user impact). Note: SPOF-O-Matic will re-request the pages you browse in order to get the original HTML to scan for blocking scripts so you may see duplicate requests for the base page in tools like fiddler or wireshark.

Latest reviews

  • (2016-02-09) Piyush Chandra: really nice tool...
  • (2015-05-24) Sergey Chernyshev: Great extension to test and showcase 3rd party dependencies.
  • (2012-10-04) stephane bachelier: great tool from patrick
  • (2012-10-04) Rene Giretzlehner: thx so much for this tool - we love it!

Latest issues

  • (2018-10-16, v:0.8) Login problems with Cloudflare and Shopify (when inactive)
    When the extensions is enabled in Chrome, but not blocks are enabled and it's functionality is inactive per it's settings, the extensions still modifies the behaviour of the browser to cause login problems with Shopify and Cloudflare.
  • (2017-06-15, v:0.8) James Moberg: Duplicate GET Requests
    I can't use this as a web developer unless there's an on/off toggle with a very visible status. I recently switched to Chrome (from Firefox Developer Edition) and this plugin was doubling every GET request and made me think there was something recursive in my web application frameworks until I tested it using Firefox and disabled all Chrome extensions. Please update the text of the "note" and market it as a "Warning".
  • (2016-10-24, v:0.8) Toby Griffiths: Had to disable as causing loss of sessions
    Hi there, I just wanted to let you know that your extension was causing my sessions to be lost, and I had to log in on every page of sites, so I've had to disable it. Hope this info helps. T
  • (2015-06-25, v:0.8) Leonard Miller: Not a negative review ... yet
    I typed this up as a review, but decided to give you a chance to fix the issues first: --- This was recommended to me, so I installed it. The language on the plugin never gave me confidence if it was on or off. Worse than that, is the server this uses for something on the back end has become unavailable, and my browser has become unbearably slow, as I need to wait for the timeouts.
  • (2015-04-27, v:0.8) Rogier Mulhuijzen: Login problems
    Hi, With this enabled, I have trouble logging into some sites. Sometimes I get a CSRF warning, sometimes sessions immediately expire. Probably related to the double requests other comments talk about. Cheers.
  • (2015-04-15, v:0.8) Michael Hodgins: Doubles up requests
    When enabled, this extension doubles up all HTTP requests. This has been driving me nuts, until I worked out that Spof-o-matic was the problem.
  • (2015-02-10, v:0.8) Maxim Kravets: HTTP requests are doubled
    Requests send twice when SPOF-O-Matic is enabled. Chrome dev tools doesn't show this
  • (2014-06-30, v:0.8) Frank Baak: Bank refuses my login
    Dutch bank Rabobank refuses my login when SPOF-o-Matic is enabled! (https://bankieren.rabobank.nl/klanten) When I disable the extension, I can login again
  • (2012-11-21, v:0.8) Andy Allen: Double execution of MySQL queries
    I have found that with SPOF-O-Matic enabled, that executing mysql_query($sql) queries the queries are being executed twice. For example I have an icon that toggles page visibility in a CMS when clicked. Clicking the button changes visibility from 1 (visible) to 0 (hidden), and vice versa. Looking at the database log entry I am getting 2 entries, one to hide the page, the next makes it visible again immediately. Creating galleries by clicking an Add Gallery button in the CMS creates 2 galleries with SPOF-O-Matic enabled, but only one when it is disabled.


1,702 history
4.2 (9 votes)
Last update / version
2012-09-12 / 0.8
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