![]() Opening the developer toolsĮvery copy of Firefox has a suite of developer tools built right into the browser (as do Chrome, Safari, Edge and most other modern browsers). Whichever approach you prefer, there are links on the last page that will help you take your web developer skills to the next level. There’s a getting started guide on Mozilla’s web developer site, but if you’re the sort of person that would rather just jump right in and get going you should still be able to complete this tutorial even without that background knowledge. The Firefox web browser (installed by default in Ubuntu desktop systems)Īlthough you don’t need any experience in web development to follow this tutorial, a little knowledge of how a web page is written might make some things a little more understandable.A computer running Ubuntu 16.04 or above.How to install Firefox Developer Edition.Why you might want to install a second browser for development.How to configure the user interface to show the tools you want.How to use the inspector and console tools.You will also learn how to install the Firefox Developer Edition alongside your normal Firefox installation, allowing you to keep development work separate from your normal day-to-day browsing. See Disable or remove Add-ons and Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems for more information.In this tutorial you will learn how to access the web development tools that are built into every copy of Firefox. Try disabling your extensions in the Add-ons Manager one by one and then reload the page. If you still have problems, follow the instructions in Troubleshoot Firefox issues caused by malware.Ĭheck if an extension is causing the problemįirefox extensions could be causing the issue, especially the ones that have network access and/or those that rely on manipulating webpage content.If you have an antivirus or Internet security program, update its detections database and do a full scan of your system.Certain types of malware are known to target Firefox and can prevent it from loading various websites: If clearing the cookies and cache didn't help, you should check your computer for malware. Make sure other items you want to keep are not selected. Below the drop-down menu, select both Cookies and Cache.In the Time Range to clear: drop-down, select Everything.Click History and select Clear Recent History….Click the menu button to open the menu panel.If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache: Click the Toggle button to set the preference value to true, if it's not already set.If such preference doesn't already exist, select Boolean and click the Add button.Click Accept the Risk and Continue to go to the about:config page. Type about:config in the address bar and press Enter Return.Ī warning page may appear.This is recommended for advanced users only. Warning: Changing advanced preferences can affect Firefox's stability and security. Any changes you've made will automatically be saved. If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (which is working normally). ![]() If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy.In the Network Settings section click Settings….In the General panel scroll down to the Network Settings section.Click the menu button and select Settings. In the Menu bar at the top of the screen, click Firefox and select Preferences.To check your connection settings in Firefox: If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. For instructions on how to configure some programs, see Configure firewalls so that Firefox can access the Internet. So, you should make sure your Internet security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add it back. Note: Some Internet security programs can block Internet access even when they are disabled.
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