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Firefix appears to be adding malicious code to the <head> of served pages

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When inspecting (Web developer / inspector) any page (eg http://bostest.aqmcl.com/phpinfo.php), Firefox reports two style tags that contain suspicious code. Those tags are not showed in Chrome, internet exploder or Edge. The same happens on all webpages on three linked PCs but not on a forth which is not synchronised to the other three. See screen shot attached...

When inspecting (Web developer / inspector) any page (eg http://bostest.aqmcl.com/phpinfo.php), Firefox reports two style tags that contain suspicious code. Those tags are not showed in Chrome, internet exploder or Edge. The same happens on all webpages on three linked PCs but not on a forth which is not synchronised to the other three. See screen shot attached...
Attached screenshots

Modified by firefox345

Chosen solution

Found it... as a mechanism for blocking ads Adblocker injects the css so that hundreds of CSS classes that are commonly used to display ads are changed to displaying nothing. Only wasted 4+ hours of my life chasing it down.

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Additional System Details

Installed Plug-ins

Adblocker Ulitmate Cisco Webex Extension Exif viewer Measure it Perfect pixel Fireshot Web developer

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0

More Information

Chosen Solution

Found it... as a mechanism for blocking ads Adblocker injects the css so that hundreds of CSS classes that are commonly used to display ads are changed to displaying nothing. Only wasted 4+ hours of my life chasing it down.

Found it... as a mechanism for blocking ads Adblocker injects the css so that hundreds of CSS classes that are commonly used to display ads are changed to displaying nothing. Only wasted 4+ hours of my life chasing it down.
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FredMcD
  • Top 10 Contributor
4274 solutions 59937 answers

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems.

That was very good work. Well Done. Please flag your last post as '''Solved Problem''' as this can help others with similar problems.
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