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Fix: Firefox 35 can’t install add-ons and extensions

Firefox just updated itself to version 35 on my current PC. I tried to install a new add-on (Session Manager, in case you are curious) but it failed to install for no reason. It gave the error message Add-on could not be installed because Firefox cannot modify the needed file.
Add-on could not be installed Firefox 35
Here is how you can resolve this issue if it ever happens on your PC.

Switch between Dark and Light Themes in Firefox Nightly on the fly

The Developer edition of the Mozilla Firefox browser comes with a different, dark theme. I discovered a trick which will allow you to switch between dark and light themes for Firefox Nightly builds. After you follow the instructions in this article, you will be able to switch between the regular and dark theme via the Customize mode of Firefox.

Enable and use the Dark Theme in Firefox

The Developer edition of the Mozilla Firefox browser comes with a different, dark theme. Here is a trick which will allow you to use this dark theme for Firefox stable builds. After you follow the instructions in this article, you will be able to get the dark theme in Firefox 35 and above.

Use YouTube without flash installed in Firefox

Being a Firefox user, you might face an issue that some videos do not play for you when you don't have Adobe Flash installed. Luckily for us, Firefox is an HTML5 compatible browser. Instead of installing Flash, you can tweak the browser and make YouTube work for you without Flash. To get it working, you need to enable the Media Source Extensions feature which is disabled by default.

How to assign a hotkey for Paste and Go in Firefox

Paste and Go is an incredibly useful feature available in almost all modern browsers including Mozilla Firefox. The only issue with it in Firefox is that it does not have a single hotkey. While you can always right click on the address bar and choose the "Paste & go" context menu item, using hotkeys is faster vs any mouse action. In this article, we will see how to assign a hotkey for the Paste & go command in Firefox.

Four ways to open a new Firefox tab in the background

Sometimes while browsing the web, often you find some interesting link on a web page, right in the middle of the text which you've yet to finish reading. At such times, you want to open that link in a background tab so you can read it later and then return to the original article. For Firefox users, I would like to share four different ways to open any link in a new background tab without installing addons.

Quickly disable ads on the New Tab page in Mozilla Firefox

The latest Mozilla Firefox shows sponsored ads on the tiles which you see on the New Tab page. If you have used the Opera 12 browser in the past or used recent Firefox Nightly builds, you won't be very surprised that ads are now in your browser's user interface! If you can't tolerate these ads, here is a simple and effective method to get rid of them.

How to restart Firefox with a single click

Here's how to restart Firefox and do not lose open tabs.

There are many occasions when you need to restart Mozilla Firefox. For example, when you enable some secret hidden feature in the Firefox browser via about:config such as "Hello" in order to use the WebRTC feature, you may need to restart it. Installing or uninstalling add-ons also means you have to restart it. While it is easy to close all tabs in Firefox manually and re-launch it, I would like to share with you a faster way which involves the built-in Firefox option.

Enable Firefox Hello to use WebRTC features

Mozilla has released a major new version 34 of the Firefox browser, and it comes with a nice WebRTC feature called "Firefox Hello". Using this feature, users can make video and audio calls to other Firefox users without any additional software or plugins. But this feature is not enabled by default so many users couldn't figure out how to use Hello in Firefox 34. Here is how to force Firefox to enable it for you.

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