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• Mozilla Firefox On Mac
• Firefox For Mac Update

This article describes what to do if Firefox doesn't open when you click the Firefox icon.

The reasons why Firefox is running slow on Mac are mostly the same as we described above: too many extensions and plugins, caches, cookies, and so on. However, we would like to add some tips to quickly check which factor is primarily affecting the browser’s speed. If Firefox works slowly, you need to disable all extensions. The document suggests that, if the firewall cannot be turned on, the user run the McAfee Virtual Technician. However, this does not seem to start using either Chrome or Safari on MacOS. Although not disclosed in the document mentioned previously or on the MVT page, I read in this community that MVT is not available for Mac. A Smart Firewall for PC is the network security in Norton 360 that monitors the traffic to and from your network and can either allow or block that traffic based on a defined set of security rules. Norton 360 Smart Firewall for PC helps protect your device and your data from malicious attacks and intrusive eyes by monitoring and helping block. Your Mac® has a built-in firewall to protect it from potentially harmful connections. In some cases, your Mac® firewall will conflict with the firewalls in t. Download Mozilla Firefox, a free web browser. Firefox is created by a global not-for-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today!

• If you get a message you can dismiss (e.g. 'TypeError: Components.classes['@ .. ;1'] is undefined', 'onload error TypeError: ..', 'Exc in ev handl: ..') and can open Firefox, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.
• If Firefox starts but won't load any websites, see Websites don't load - troubleshoot and fix error messages.

Table of Contents

• 1Specific error messages
• 2No error message

Mozilla Crash Reporter

If you get the 'Mozilla Crash Reporter' window when you start Firefox, see Troubleshoot Firefox crashes (closing or quitting unexpectedly) for solutions.

Firefox is already running but is not responding

See 'Firefox is already running but is not responding' error - How to fix for solutions.

Your Firefox profile cannot be loaded. It may be missing or inaccessible

See How to run Firefox when your profile is missing or inaccessible for solutions.

Failed to read the configuration file

This error is caused by a problem with Firefox program files. The solution is to remove the Firefox program and then reinstall Firefox. Win wellness program. (This will not remove your passwords, bookmarks or other user data and settings which are stored in a separate profiles folder.)

1. Uninstall Firefox.
2. Delete the Firefox installation directory, found in one of these locations by default:
   • C:Program FilesMozilla Firefox
   • C:Program Files (x86)Mozilla Firefox
3. Use another browser to download the Firefox installer from the Firefox download page and install it. See How to download and install Firefox on Windows for details.

XULRunner - Error

If you see the message, 'XULRunner - Error: Platform version <x.x.x.x> is not compatible with minVersion <x.x.x.x>' ('<x.x.x.x>' depends on version number), after a software update, use another browser to download the Firefox installer from the Firefox download page, save it to the desktop or other location, delete the Firefox installation directory and then reinstall Firefoxreinstall Firefoxreinstall Firefox.

• If Firefox still does not start, see the Firefox will not start after updating section below.

There was an error launching the application

This error indicates that either Firefox is not installed or your shortcut to it is incorrect. Make sure that Firefox is installed at the location specified by the shortcut. If it isn't, install Firefox if necessary, then modify the shortcut to point to the correct location.

Error opening file for writing…

If you receive the above error when launching Firefox on a Windows system, you may be required by Firefox to log in as an administrator. You can either reboot the computer or, if you have an administrator account, you can execute the program as an administrator.

1. Find the firefox.exe program file in the Firefox application folder on your system.
2. Right-click the icon.
3. Select Run As….Select Run As Administrator…. Select The following user:. From the User name drop-down, select Administrator or another user that has administrator privileges. Enter the password required to log in to this account. Click .
4. The Firefox application is started using the administrator Windows account. The user that was used to log in to Windows at startup is still the active one.

Other error messages

If you get another error message (e.g. 'XML Parsing Error: undefined entity Location', 'Secure Connection Failed … uses an invalid security certificate'), see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

If you click the Firefox icon but no Firefox window opens and no error message is shown, a simple first step is to restart your computer and then try again. If Firefox still does not start, see the following sections.

Firefox will not start after updating

• Outdated versions of Comodo Firewall or Comodo Antivirus security software (or a leftover file after Comodo was uninstalled) can cause Firefox not to start with no error message. Update Comodo to the latest version, if you have it installed. If Comodo software is not installed, check if there's a file called IseGuard64.dll or IseGuard32.dll in your C:Windowssystem32 folder or your system drive and, if so, manually delete the file.

• If you use certain versions of ZoneAlarm or other Internet security software that includes a 'Virtual Browsing' feature, it can prevent Firefox from starting. Check virtualization settings and clear the virtual cache, if your Internet security software includes this feature, or visit the software provider's support site for more help.
• Firefox may fail to start for some Windows users after updating, if AVG or AVAST antivirus is installed. For details, see this Techdows article.

Firefox will not start after installing add-ons

If Firefox previously worked but stopped after you installed extensions or themes, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

Firefox previously worked

If Firefox previously worked but suddenly doesn't start, it may be due to some corrupt data in your settings. Uninstalling and reinstalling Firefox would not fix this problem because your settings are not removed on uninstall.

To test to see if this is the problem, use the Profile Manager to create a new profile. If the problem goes away, you can then move your bookmarks and other important settings into the new profile.

Firefox will not start because of missing libraries

If you installed Firefox outside of your package manager, make sure that your system has the libraries listed in the system requirements.

Based on information from Browser will not start up (mozillaZine KB)

One of the most important tools in your online security arsenal is a firewall. Firewalls block incoming and outgoing network connections and can often be configured to be as strict or as relaxed as you like. You can also usually configure a firewall to prevent your Mac from being “pinged” – where a piece of data is sent to it over the network to check if it’s “there.”

Firewalls can be software or hardware, though most these days are software. macOS has its built-in firewall that can be configured in the Security & Privacy pane of System Preferences and your broadband router probably has one too. Your router’s firewall, if it has one, can be turned on and off in the settings webpage for the router.

Tip
Want to know how to turn on the firewall on your Mac? Just go to System Preferences > Security & Privacy > Firewall and turn it on.

Why download another Mac firewall?

If your Mac already has a firewall built-in, why would you consider a third-party version? Well, for one thing, the macOS firewall only blocks incoming connections; it doesn’t protect you from security threats that come from outbound traffic. Though there are advanced options tucked away, it’s not as configurable as some third-party firewalls.

Mozilla Firefox On Mac

Did you know?

In addition to a firewall, it’s a good idea to use an anti-malware tool to scan your Mac regularly and keep it safe. CleanMyMac X does just that. You can use it to scan your Mac manually, and it will compare what it finds against a database of known malware. Or set it to monitor your Mac in real-time, so that it protects it automatically. Download CleanMyMac X – a free trial is available.

The best firewalls for your Mac

Little Snitch

Little Snitch has been around for almost as long as macOS. Its goal is to block apps from making outgoing network connections unless you explicitly choose to allow it. This is useful for a couple of reasons.

1. It stops apps from contacting a server and sending data about you to it.

2. It alerts you to software that shouldn't be on your Mac i.e., malware, and is trying to connect to a host server.

When an app initiates a connection to a server, Little Snitch alerts you and offers you the opportunity to allow it to connect or to prevent it. It learns from your decisions and creates rules based on them. Neatly, there’s a silent mode that hides alerts so that you’re not bombarded with them – there are a lot of them at first. You can then come back to alerts later to make decisions and create rules. Mathsthird grade james tes.

Lulu

We mentioned earlier that the macOS firewall is good at blocking incoming connections. Lulu complements that by blocking outgoing connections, similarly to Little Snitch. By default, it blocks all outgoing connections. If you decide to allow an app or service to connect, every attempt made by that app or service will be allowed. Lulu’s source code is published on GitHub so anyone can inspect it.

HandsOff

Unlike Lulu and Little Snitch, HandsOff blocks both incoming and outgoing connections. And it allows you to closely monitor and control apps that use internet connection to send information back to a remote server. Besides, HandsOff can also block domain name resolving, multiple subdomains, and offers protection from trojans and worms.

HandsOff’s options are more finely-tuned than most, allowing you to block all outgoing connections from an app or only those to a specific domain, subdomain, or IP address. You can also choose to block the connection once, until the Mac is restarted, or permanently.

Radio Silence

Radio Silence is the simplest and most elegant of the firewalls available for macOS. There’s nothing to configure and no pop-up windows to distract you. One small window is its only user interface element. That window is split into two tabs.

One, titled Network Monitor, displays all the apps that have open network connections. Next to the app is a number showing you how many open connections it has open. Click on that number, and you can see a list of connections.

Murus Pro

Murus Pro consists of two apps, Murus and Vallum. The former will perfectly complement the macOS built-in firewall by providing an interface that allows you to create rules for incoming connections. The latter, Vallum, is similar to Little Snitch and Radio Silence – it allows you to monitor and block incoming connections.

Murus allows you to drag and drop elements to create sets of rules from pre-created presets. Or, you can re-write your own rules from scratch. If what you want is to fine-tune the built-in macOS firewall, Murus could be the ideal tool.

Firefox For Mac Update

Vallum monitors and intercepts outgoing connections and lets you block them. It sits in the menu bar until you decide to configure it. When you do, like Murus Pro, you can do it by dragging and dropping. For example, to prevent an app from making outgoing connections, you just drag it from the Finder onto the Vallum window. You can modify the firewall rules for each app manually, or use one of the predefined presets.

There are several very good firewall tools available for Macs. Some complement Mac’s built-in firewall and block incoming connections; others are focused on outgoing connections. Whichever you choose, it’s a good idea also to use additional security and Mac maintenance tool such as CleanMyMac X.

You may be surprised at just how many network connections some apps make. And next to that number is a Block button, allowing you to prevent the app from making connections. Press that button, and the app shows up in the other tab, Firewall. That tab lists all the apps you’ve blocked from making connections. It’s a very simple but effective tool that has won praise and rave reviews from some of the most well-known Mac blogs and websites.