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Sadly, Wikilook is broken again. Maybe someone can make it work again but, considering that the last update was over four years ago, I don't hold much hope.
I can confirm what kolika33 mentioned: Wikilook 2.7.0 conflicts with Adblock Plus. When Wikilook is active, Adblock Plus can't save custom filters. Strange, but true.
Meanwhile, I have found a good alternative for Wikilook. It's not 100% the same, but close enough, and in some respects even better. It's "Wiktionary and Google Translate" (https://addons.mozilla.org/en-US/firefox/addon/google-dictionary-and-google-t/). Try it if you're looking for a Wikilook replacement.

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It looks like, sadly, Wikilook's development has stopped. And recent changes in Firefox mean that Wikilook is no longer working as it used to.
Fortunately, user Alan Stewart has posted a working fix at Wikilook's Support page (http://groups.google.com/group/wikilook).
In case you don't have access to that Support page, I'm copying the fix here so more people have access to it:

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In the file chrome/wikilook/content/wikilook.js line 4746 is not valid syntax in the newer javascript engine:

globalPackageWL.WikiLook_Overlay.PMaker.WLWTajaxCallbackImpl(res.expandtemplates.*);

Changing that line to an alternate equivalent syntax:

globalPackageWL.WikiLook_Overlay.PMaker.WLWTajaxCallbackImpl(res.expandtemplates['*']);

works for me - all of wikilook is functional with ff21
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All credit for this fix should go to Alan Stewart, I'm just copying his solution here.

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Great! It's working again (v. 2.2.1). Thanks to Vitaly, the developer, (or whoever updated it) for fixing it.

这个评论是针对附加组件的一个早期版本的(2.2.1)。 

Thank you for support! Hope you like new smart search feature.

评分5星,满分5星

Wow! Excellent add-on. Thank you to the developer. May I add that I managed to change the green background color with a little hacking, but it could be implemented as an option in future releases.

这个评论是针对附加组件的一个早期版本的(1.3.4)。