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If you arrive here directly and are somewhat confused, read more about this gallery on ZDNet.
In this screenshot, you can see that my Facebook wall is full of test Wall posts, but Wall posts nonetheless. I could easily select each one and hit 'Delete' but this will take forever, especially if you have a profile stretching years back.
If you are lucky enough to not have enabled the new timeline, then you have saved yourself a great deal of time -- should this method work for you. If it does not, then never fear. There are other options you can explore.
1. For this, you need to be running Firefox as your web browser, and not Chrome. It's not clear why the 'magic button' does not work on Chrome, but it doesn't.
2. Head to the Mozilla Addons pages from your Firefox browser. You should be looking at a script called Greasemonkey.
Greasemonkey allows users to install scripts to Firefox to change the behaviour of web pages, or to add additional tools and tweaks to web applications, such as Facebook. From here, we want to install the add-on.
3. Click the Add to Firefox button. You may be prompted a few times to install the addon to the browser.
4. You should then restart Firefox when it prompts to you to do so. In doing this, it will install Greasemonkey and will allow you to install additional scripts.