• To Disable Firefox Default Browser Agent, Open Firefox. In a new tab, type about:config in the address bar. Click I accept the risk. In the search box, type or copy-paste the line default-browser-agent.enabled. Double-click on the line in the search result or use a toggle button to switch it from true to false.
• From the Windows Start menu: Type Default apps. Under Web browser, select the current default, then choose a new option. Make Chrome the default: Open Chrome. Select Menu Settings Default Browser Make Google Chrome the default browser. Make Firefox the default: Open Firefox. Go to Menu Options General Startup and select Make Default.

This article describes alternate ways of setting Firefox as the default browser when setting it from the Firefox optionspreferences window does not work.

Symptoms of this problem can include:

• Firefox reports that it is not the default browser when you check using the Firefox optionspreferences window.
• Firefox prompts you to set Firefox as the default browser each time it starts.
• Firefox does not open after clicking on links in other programs.

Table of Contents

That was about manually setting Firefox, Chrome or IE as the default browser. Tomorrow, we will take up Safari and Opera, and see how to change default browser in that case. Last updated on 8 Feb.

• 2Using your operating system

The preferred method of setting Firefox as your default browser is described in the Make Firefox your default browser article. Most external programs will open links in Firefox if it is set to be the default browser using that method.

Follow the instructions below if you have tried the steps in the Make Firefox your default browser article and found that they did not work.

Windows 10

1. Go to the Windows Start menu and click the Settings icon.
2. Click Apps, then choose Default Apps on the left pane.
3. Scroll down and click the entry under Web browser.
4. Click on Firefox in the dialog that opens with a list of available browsers.
5. Firefox is now listed as your default browser. Close the Settings window to save your changes.

Windows 8

1. Open the PC Settings application (press and release the Windows Start button, then click the gear icon).
2. Select Search and apps from the sidebar.
3. Select Defaults from the sidebar.
4. In the Set Default Programs window, select Firefox from the list of programs on the left and click . Then click to close the window.

Windows 7 and Vista

1. Click on the Windows logo to open the Start menu, then select Control Panel. The Control Panel window will open.
2. Click on the link labeled Programs. The Programs panel will open.
   
3. Click on the link labeled Set your default programs. The Set your default programs panel will open.
   
4. In the Programs list on the left side of the window, click Firefox.
5. In the right side of the window, click Set this program as default.
   

Windows XP

1. Click the Start button, then click on the Control Panel icon to open the Windows Control Panel.
2. Click the Add or Remove Programs icon to open the Add or Remove Programs applet.
3. On the left side of the window, click the Set Program Access and Defaults icon.
4. Click on the Custom radio button to expand the Custom category.
5. Underneath Choose a default Web browser click the radio button next to Mozilla Firefox.
   
6. Click at the bottom of the window.

Ubuntu Linux

1. In the System menu, open Preferences, then Preferred Applications.
2. On the Internet tab under Web Browser, choose Firefox in the drop-down.
3. Press .

Mandriva Linux + KDE 4

1. In the KDE Systemsettings, go to the Advanced tab, then to the File associations icon.
2. Click on the html tab under text, choose Firefox in the menu, rise it to the top of the list.
3. Press .

Fedora Linux + KDE 4

1. In the Applications menu, open the System Setting tab, then go to the Default Applications icon.
2. Click on the Web Browser line on the list of displayed services and type firefox in the Default Component menu.
3. Press .

Use one of these methods to set Firefox as the default browser on your Mac:

From the Apple menu

1. Choose System Preferences from the Apple menu.
2. Click .
3. Choose Firefox from the Default web browser drop-down menu.

From Safari

Firefox Default Browser Bing

1. From the Dock, open Safari.
2. From the menu bar, click the Safari menu and select Preferences....
3. Click the General icon, to display the General preferences panel.
4. In the Default web browser: drop-down list, select Firefox.
   
5. Quit Safari.

Download Firefox

Some programs may have features that open another browser to display content, even though Firefox is set as the default browser. For example:

Firefox Default Browser Iphone

• Microsoft Outlook has a 'View in Browser' feature that will open a browser window to display the content of an HTML email message. Outlook converts the message content to MHTML (MHT) format and then opens the program associated with that file type, normally Internet Explorer.