Were do suspicous add-ons Download Keeper come from?

Today, I noticed an advertisement on a page I visited. This advertisement was labelled "Download Keeper" and showed a few pictures with products and prices in dollars. I didn't expect such advertisements on the site in question and so I looked more closely at it.
In the mark-up, I find a lot of elements containing classes starting with SF_ like SF_IIAD_EXPL and url's starting with http://www.superfish.com. Also, some javascript files are loaded from http://rvzr-a.akamaihd.net.
Then, I looked at my add-ons and found 4 suspicious ones:
DDoowload keeper 1.6
DoWnlOad KeeEper 1.6
Download keeper 1.6
DownnlOadd KeepEr 1.6
How could these have come here? I certainly didn't add them intentionally. Will they have come in with some software installer? Is there some way I can prevent these types of add-ons to be installed?

Sometimes when you download and install software it includes a bundle of undisclosed programs...
I suggest disabling ALL nonessential or unrecognized add-ons on these two tabs:
* orange Firefox button (or Tools menu) > Add-ons > Plugins category<br>''Set unimportant plugins to "Never Activate"''
* orange Firefox button (or Tools menu) > Add-ons > Extensions category<br>''Click Disable for unimportant or unwanted extensions''
Usually a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Although you may be tempted to remove some of them immediately, before doing that, I suggest seeing whether some more general malware scans will clean them up so they don't get re-injected into Firefox. This article has a range of free tools you can use for that: [[Troubleshoot Firefox issues caused by malware]].

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