The extension should not be confused with Firefox's Tabs on Demand feature. Despite that, it can be an interesting add-on for Firefox users who run many tabs in the browser and notice that Firefox is not as responsive as it should be. I'd like to see an option to whitelist particular domain names so that they won't be suspended as well. The Firefox extension comes with an option to not suspend pinned tabs in the browser.
While you could deal with the issue differently, for instance by installing NoScript or a Flash blocker, the solution may not be as comfortable and automatic as what Suspend background tabs has to offer. It is unfortunate that the extension does not cover Flash related contents as well, as they can draw lots of resources even in the background. You will notice on these sites that the messages will only get refreshed once you activate the tab again. The add-on suspends automatic actions by websites, for instance the automatic updating of messages on Twitter or Google Mail, until you activate the tab again. If you limit your tabs to less than ten, you will probably not notice a big difference unless your computer is a bit on the low side resource-wise. This extension works best for users who have dozens of tabs open in the Firefox web browser.
Once you have installed the extension in Firefox it works automatically from there on out. The author of the extension notes that it currently won't take action on sites with Flash or media contents, but that a future version may introduce the - in my opinion much needed - feature. The Firefox add-on Suspend Background Tabs tackles the issue by suspending actions in background tabs.
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