Add another to the "not recommended" list:
AVG Secure Search and Toolbar.

These are being bundled with downloads from trustworthy sites. It is necessary to volunteer to install these AVG utilities so these are not sneaky malware.
However I regret to say that AVG has sunk pretty low in value. I was very satisfied with AVG on my older PCs. AVG anti-malware worked and uninstalled cleanly.
Unfortunately AVG Toolbar offers little or nothing of value - typical of most toolbars which seldom deliver much of use and tend to just create browser clutter. I had the same problem with Winamp toolbar - it didn't seem to work well with the web streams I wanted to hear, so it was just clutter. But at least the Winamp toolbar uninstalled cleanly, no tricks.
AVG Secure Search is basically a net-nanny wrapper around Google. It duplicates the site ratings of stuff like WOT, McAfee and others. Annoyingly, Secure Search disables useful features such as auto-complete and preview. While disabling those might help keep web rookies safe, it's mostly annoying. And it cannot be customized to minimize intrusiveness.
Note that the best Firefox add-ons like NoScript and Ad Block Plus offer plenty of customization to suit the user while not completely disabling useful web features. AVG Secure Search is far from competitive with those add-ons.
Worse, the uninstall process for AVG Secure Search is a mess. Unlike every trustworthy Firefox add-on, using the standard disable/uninstall process will not clear out AVG Secure Search. Every time I'd restart the browser, it would ignore my default preferences (Google or other) and reset the home page to AVG Secure Search.
The Windows uninstall process was only partially effective. I had to use extra steps provided by AVG to completely remove AVG Secure Search.
AVG used to offer great value in anti-malware software but they're mostly an aggravation now. Malwarebytes and others offer much better value and standard clean uninstalls.