JavaScript Info

In my add-on I have an HTML page that gets displayed upon install/update. Firefox obviously shows t… Read more Hide Location Bar From Firefox Add-on

I've been trying to add the highlighting feature to the Firefox DevTools debugger, so it will h… Read more How Do I Get Firefox Debugger Watch's Target Element?

I have a basic Google Chrome extension which needs to be ported to Firefox. I uploaded the .crx fil… Read more How To Test Firefox Plugin Locally

I am trying to create a key element dynamically for my bootstrapped add-on. Currently, I create a k… Read more How To Set An Xul Key Dynamically And Securely?

Anyone, help me, how to get Headers and PostData inside extension, using xpcom/something else? i ca… Read more Get Postdata As In Firebug

Say a webpage has a function like: function abc (){ return 'abc'; } How would I execute an… Read more Execute Function On Webpage?

I have recently converted a GreaseMonkey script of mine into a WebExtension, just to get a first im… Read more Firefox Webextension: How Do I Run Code Prior To Disable/uninstall?

Reference to the answer for my previous question here. Briefly: When an error occurs in a navigatio… Read more Webnavigation.ondomcontentloaded Url Filter Does Not Match Dns Error Url

I wonder if it is possible to get values of certain preferences set in about:config using javascrip… Read more About Config Preferences And Js

I'm a bit confused about how you can or cannot make crossdomain ajax requests in addons for Fir… Read more Making Crossdomain Ajax Requests With Addons For Firefox

Possible Duplicate: Firefox extension: check if window is minimized I've written a Firefox ex… Read more Browser Window Minimize/maximize Event

I am trying to create an addon that will allow the user to query a dictionary site at will and view… Read more Mozilla Addon Development - Communicating Between Windows With Different Domains

How do I include jquery and other scripts in my firefox extension? I know this topic is a copy of m… Read more Adding Jquery And Other Js Libraries To Firefox Extension

So, I've looked through the WebExtensions API, but I haven't been able to figure out how to… Read more How To Open A Firefox Webextension Options Page As A Tab, Separate From About:addons

I am trying to find a way where by we can auto save a file in Firefox using JS. The way I have done… Read more Auto Save A File In Firefox

I have an object that contains circular references, and I would like to look at the JSON representa… Read more "too Much Recursion" Error When Calling Json.stringify On A Large Object With Circular Dependencies

I'm working on a Mozilla Add-on SDK extension that provides a right-click context menu option u… Read more Add Menu Item Created With The Sdk/context-menu Api To The Top Of The Context Menu

I'm creating (developing) a Firefox add-on and I need to find browser's user agent. The nav… Read more How To Find Out Browser's User Agent In Firefox Add On

I am building a Firefox add-on using the addon-sdk. The add-on has one button that displays a panel… Read more Why Is My Add-on Panel´s Content Script No Longer Responding To Port Messages After Changing ContentUrl?

I'm experimenting firefox webextensions. I'd like to make HTTP requests using the fetch API… Read more Fetch Api Does Not Work In Webextensions