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After performing an update in Firefox, whatever searches that I tried in google will shows popup with the following error message:
ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)
1:()
2:()
3:()
4:epsGetAttr([object Object],alias)
5:()
6:SRCH_SVC_getEngineByAlias(http://www.google.com.au/search?q=how+to+include+user+as+a+root+in+Ubuntu%3F&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a)
7:getEngineByAlias(http://www.google.com.au/search?q=how+to+include+user+as+a+root+in+Ubuntu%3F&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a)
8:getShortcutOrURI(http://www.google.com.au/search?q=how+to+include+user+as+a+root+in+Ubuntu%3F&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a,[object Object])
9:canonizeUrl(null,[object Object])
10:handleURLBarCommand(null)
11:anonymous(textentered,null)
12:fireEvent(textentered,null)
13:onTextEntered()
14:handleEnter(true)
15:onPopupClick([object MouseEvent])
16:onxblmouseup([object MouseEvent])

Affect
Whatever URL links and pages will not be able to opened up and will be prompted with a [...]