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I always uses Mozilla Firefox, Since Last 3 days I noticed that I showing some annoying adds on Google Homepage and on Youtube and some javascript popups on other site words while when i checked site and google homepage on chrome its contain no add. Is my firefox infected, I am using Firefox 19.0 on Ubuntu 12.04

I tried to track by Inspecting element and I found when google home page loaded following urls are fetched

[22:02:54.120] GET [HTTP/1.1 302 Found 598ms]
[22:02:54.920] GET [HTTP/1.1 200 OK 1515ms]
[22:02:57.797] GET [5925ms]
[22:02:57.799] GET [HTTP/1.1 304 Not Modified 1623ms]
[22:02:57.800] GET,or.r_gc.r_pw.r_cp.r_qf. [HTTP/1.1 200 OK 768ms]
[22:02:57.801] GET [HTTP/1.1 200 OK 2225ms]
[22:02:59.769] GET [HTTP/1.1 200 OK 2216ms]
[22:03:01.938] GET [HTTP/1.1 200 OK 687ms]
[22:03:02.646] GET [HTTP/1.1 200 OK 3619ms]
[22:03:05.969] Error: Permission denied to access property 'toString' v=3&s=webhp&action=&e=31215,39523,4000116,4001569,4001947,4001959,4001975,4002159,4002207,4002562,4002734,4002854,4003053,4003178,4003372,4003387,4003496,4003575,4003638,4003715,4003722,4003881,4003917,4003944,4004015,4004065,4004074,4004181,4004214,4004257,4004276,4004309&ei=uIYvUdDfGIjMrQeB5oBI&imc=5&imn=5&imp=0&atyp=csi&adh=&rt=xjsls.652,prt.660,xjses.846,xjsee.935,xjs.948,ol.9682,iml.660,wsrt.275237,cst.188,dnst.0,rqst.914,rspt.640 [HTTP/1.1 204 No Content 250ms]
[22:03:06.526] GET [HTTP/1.1 304 Not Modified 514ms]
[22:03:06.528] POST [HTTP/1.1 200 OK 387ms]
[22:03:06.963] Expected declaration but found '['.  Skipped to next declaration. @
[22:03:07.256] GET!VvZ7oDep-coJNQTnkA%2Fd%3D1#pid=1&rpctoken=312623097&_methods=onError%2ConInfo%2ChideNotificationWidget%2CpostSharedMessage%2Creauth%2CsetNotificationWidgetHeight%2CswitchTo%2CnavigateTo%2CgetNotificationText%2CsetNotificationText%2CsetNotificationAnimation%2ChandlePosted%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart&id=gbsf& [HTTP/1.1 200 OK 577ms]
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migrated from Mar 7 '13 at 3:15

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Try disabling all extensions and check if those still show up. – gronostaj May 24 '13 at 6:41

I had the same problem today in Chrome, running on Ubuntu 10.04. An advertisement would pop-up on every page that i visited and i fixed the problem installing Chrome's AdBlocker (guess you can find something like that also for Mozilla) and it KINDA helped. The adds were gone, but a small [X] (for closing the ad) was still appearing in the browser. I installed a script-blocker (also a extension from Chrome), and actually didn't tell him to do anything and now everything is back to normal. I also disabled the script blocker and everything is still fine. Who knows whats gonna happen next, hope this maybe helped

A script that i found in my Page Source (and it shouldn't have been there) was this one:

Maybe the above link will make it easier for people to find this discussion.

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