How do I enable an add-on in Firefox safe mode?

So recently I have had a problem with Firefox crashing all the time and found out it was an add-on that was causing the problem.
I have tried opening Firefox in safe-mode to disable add-ons but they are already disabled, so I want to know how to enable an add-on and then to permanently disable it so Firefox will open normally again. . .
I have already tried to permanently disable all add-ons by using the Firefox options box but nothing happens after I click on the 'make changes and restart firefox' button. After I click it nothing happens and it remains frozen. ([https://support.mozilla.com/en-US/kb/Safe%20Mode Safe mode Window])
So to make things short, how do I enable an add-on in Firefox safe mode?

In Firefox 4 and later [http://kb.mozillazine.org/Safe_mode Safe mode] disables extensions and also disables hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.
You should still see a Disable button or Enable button (if you disabled them all) in the extension Manager (Tools > Add-ons > Extensions) if you start Firefox in Save mode.
*https://support.mozilla.com/kb/Safe+Mode

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Clear the cache and the cookies from sites that cause problems.
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*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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My Avira Anti-Virus program has alerted me to hidden viruses. These viruses can only be removed by booting up with an Avira Rescue Disk, or by starting the computer in Safe Mode and then running my anti-virus program in Safe Mode. My Lenovo Y560p will not bootup with the Avira Rescue Disk. Neither will it start in Safe Mode when I hold down F8 during startup. In both cases, Windows 7 (64bit) is starts normally, overriding the Avira Rescue Disk in the optical DVD drive or F8 being held down. (I've also tried F6.) How can I force the machine to start in Safe Mode, so that I can get rid of the hidden viruses?
Solved!
Go to Solution.

Hi ecbritz,
Welcome to Lenovo Community.
There is no magic bullet. There is no one-size-fits-all. If you were to use an all-in-one (suite) such as Norton Internet Security, you would be getting the definitions from just one vendor. Different security vendors find different things. One also has to wonder if a company known for anti-virus protection is equally as good as one that specializes in firewall protection.This is not to say that more than one anti-virus should be installed. Use only one AV. A layered approach with "the best of all worlds" usually is advisable.
To address your question, I recommend Microsoft Security Essentials (free) or Eset's NOD32 Antivirus (paid). Over the years I have used Norton, Trend Micro, AVG, Avast!, MSE and NOD32. I have remained with MSE and NOD32 on my computers. None of my computers have ever had an infection.
For the next layer, I add Malwarebytes (free on-demand is good; paid with realtime protection is better).
As far as online browser security, along with your anti-virus and anti-spyware software, Web Of Trust , uses colored alerts to warn you about risky websites that try to scam visitors, deliver malware or send spam. Protect your computer against online threats by using WOT as your front-line layer of protection when browsing or searching in unfamiliar territory. WOT's color-coded icons show you ratings for 21 million websites, helping you avoid the dangerous sites:
Red for Warning = STOP
Yellow for Use Caution
Green for Safe
Grey for Unknown
There is a Web Of Trust version for Firefox as well.
You might also want to install SpywareBlaster: http://www.javacoolsoftware.com/spywareblaster.html
It will:
Prevent the installation of ActiveX-based spyware, adware, browser hijackers, dialers, and other potentially unwanted software.
Block spyware/tracking cookies in Internet Explorer and Mozilla Firefox.
Restrict the actions of potentially unwanted sites in Internet Explorer.
Tutorial here:http://www.bleepingcomputer.com/forums/tutorial49.html
Periodically check for updates.
Several of us here run Winpatrol. Winpatrol is heuristic protection program, meaning it looks for patterns in codes that work like malware. It also takes a snapshot of your system's critical resources and alerts you to any changes that may occur without you knowing. You can read more about Winpatrol's features here. You can download a free copy of Winpatrol or use the Plus version for more features.
You can read Winpatrol's FAQ if you run into problems.
Many of us in the online security community have tried and tested programs to determine their abilities. Please remember that there is no guarantee regarding computer security. However, the available software, combined with good surfing habits and keeping the software updated will contribute to helping your system running safely.
ThinkPad: T530 / X1 Gen 2 / Helix - Yoga: Tablet 2 Pro (Win) / Yoga 3 Pro
If you find a post helpful and it answers your question, please click the "Accept As Solution" button.
Lenovo Advocate ~ I am not employed by Lenovo or Microsoft. I am a volunteer.
Microsoft MVP - Consumer Security
SpywareHammer

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How do I enable an add-on in Firefox safe mode?

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