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Malwarebytes won't let me open Firefox

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— Brief description of the issue
I've recently installed Malwarebytes and I have a problem, whenever I try to open Firefox Malwarebytes says "an exploit has been automatically blocked."

— Screenshot of the issue

If the system crashed, please include the BSOD error message
The system hasn't crashed.

— Operating system details
Windows 10 Pro / 64-bit / 10.0 (Build 14393)

— Details on how you encountered the bug and any steps that can be taken to reproduce it
I just try to open Firefox and Malwarebytes blocks it, as simple as that,

Do you get the same result more than once if you follow the same steps?

— A copy of the contents of C:\ProgramData\Malwarebytes\MBAMService\logs in a ZIP file (attach to post)
I'll edit the post with it, please wait.

— Here's the log file produced when I export the report into a text file.


-Log Details-
Protection Event Date: 2/5/17
Protection Event Time: 10:08 AM
Administrator: Yes

-Software Information-
Components Version: 1.0.50
Update Package Version: 1.0.1185
License: Premium

-System Information-
OS: Windows 10
CPU: x64
File System: NTFS
User: System

-Exploit Details-
File: 0
(No malicious items detected)

Exploit: 1
Malware.Exploit.Agent.Generic, , Blocked, [0], [-1],0.0.0

-Exploit Data-
Affected Application: Mozilla Firefox (and add-ons)
Protection Layer: Malicious Memory Protection
Protection Technique: Exploit code executing from Heap memory blocked
File Name: 


(EDIT) In case it is of any help, I'm using Windows Defender along with Malwarebytes, nothing else.


Edited by Mura
added the antivirus I'm using
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3 hours ago, dcollins said:

It looks like the block is happening because of MacType on your machine. I am unable to replicate on my local machine, so perhaps your MacType software is out of date? Can you see if there's an update available for you for that software?

I have MacType updated to its latest version (1.16.0904)

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2 minutes ago, dcollins said:

Strange that I can't reproduce this with the same outcome. Can you verify that Firefox is up to date as well, I'm showing the latest is 51.0.1 and I'm using 32-bit. You can view this by going to Help -> About Firefox

I have the same version as you.


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The weird thing is that I have no problems if I open Firefox through Malwarebytes. Like, for example, I try to open Firefox normally through my desktop and Malwarebytes blocks it, but if I go to the "Reports" section of Malwarebytes and I click on "More information," Firefox opens this page without any problem at all and I can continue using the browser just fine.

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26 minutes ago, dcollins said:

Would you mind uninstalling MacType just to see if that makes a difference? 

With MacType uninstalled everything works just fine, I'd rather not have to stop using it though because I hate the way Windows handles fonts and with MacType everything looks so much better.

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