I need to fix a virus when using firefox, which is this: Log in to X Marks

Recently several minutes after entering internet to see my mail, when using Firefox in my new Toshiba computer, a virus appears like a little box with the inscription "Log in to X Marks", impeaching me to continue checking my electronic mail. Today I have run Malwarebytes and Mcfee with any sucess at all. I thank you in advance for your help

Since many bad add-ons install outside of Firefox and don't have a remove button, here's my suggested procedure for tracking down and cleaning up bad add-ons. I know it seems long, but it's not that bad.
(1) Open the Windows '''Control Panel''', Uninstall a Program. After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here.
(2) Open Firefox's '''Add-ons page''' using either:
* Ctrl+Shift+a
* "3-bar" menu button (or Tools menu) > Add-ons
* in the Windows "Run" dialog, type or paste <code>firefox.exe "about:addons"</code>
In the left column, click '''Plugins'''. Set nonessential and unrecognized plugins to "Never Activate".
In the left column, click '''Extensions'''. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions.
Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Any improvement?
(3) You can search for remaining issues with the '''scanning/cleaning tools''' listed in our support article: [[Troubleshoot Firefox issues caused by malware]]. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.
Success?

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*http://kb.mozillazine.org/Cookies
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* [[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
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== This happened ==
Every time Firefox opened
== I tried to type a "?" in a work email using remote access.

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''FredMcD [[#answer-718738|said]]''
<blockquote>
''ajfollack [[#answer-718681|said]]''
<blockquote>
Disabling the adobe plugin . . . . did not resolve issue
</blockquote>
DO NOT disable old program. REMOVE them.
Many site issues can be caused by corrupt cookies or cache.
* Clear the Cache and
* Remove Cookies '''''Warning ! ! '' This will log you out of sites you're logged in to.'''
Type '''about:preferences'''<Enter> in the address bar.
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* '''Cache;''' Select '''Advanced > Network.''' Across from '''Cached Web Content,''' Press '''Clear Now.'''
If there is still a problem,
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences#advanced'''<Enter> in the address bar.
Under '''Advanced,''' Select '''General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.
</blockquote>
I uninstalled Adobe reader, then did the rest of your suggestions but the problem remains. It is only with 3 emails that get resent daily with slight changes to the text. It is like most of the text has been removed from the email.
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[edited to add:]
After browsing through related problems in the discussions, I saw this link to a third-party web site being handed out. Perhaps you'll find it useful: http://www.thexlab.com/faqs/kernelpanics.html
Message was edited by: Stephen Adams

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*https://support.mozilla.org/kb/Private+Browsing
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*https://support.mozilla.org/kb/Safe+Mode
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see -- http://kb.mozillazine.org/Kill_application
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The following will result in complete loss of history if it comes down to deleting places.sqlite, so rename files rather than deleting. With Firefox down.
Of course you have backups of your profile you could replace rename and
replace those files instead.
Locked or damaged places.sqlite - MozillaZine Knowledge Base
:"Toolbar buttons such as Back/Forward are disabled "
:http://kb.mozillazine.org/Locked_or_damaged_places.sqlite

I need to fix a virus when using firefox, which is this: Log in to X Marks

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