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New Features In Firefox 33 For Desktop And Android

Firefox 33 is out for both Desktop and Android. You should be prompted to upgrade the next time you launch it and if you’re a developer, you might want to upgrade right now. This latest instalment is a treat for developers with two new noteworthy features; a media sidebar in the Style editor and a paint flashing tool. End users will want to upgrade for the improved search functions and the more reliable session restore feature. Firefox for Android is also supporting the new Paint Flash tool for developers. For End users the new option to delete data when you quit the app is very promising as is the ability to stream video content to Chromecast and Roku.


Firefox 33 Desktop

 Improved Search Experience

We’re bundling two features under one head; Firefox 33 does two things to speed up search. It offers search suggestion on the Firefox home page (about:home) and the new tab page (about:newtab). It additionally does something different to speed up the search result. With prior versions, if you were to type in a single word or mathematical expression, the browser would take a considerable time to give you any results. It was looking for locally hosted sites that would correspond to the search term. With this update, it now searches online first while conducting a local search in the background.

Session Restore Is More Reliable

This is a feature that has often failed on me in the past so I’m glad Mozilla paid some attention to it. Session restore is now more reliable which means that message you get about Firefox not being able to restore your previous session will be seen far less frequently.

ff33 restore session

Media Sidebar In Style Editor

This is a new bar that appears when you have the style editor open. It lists rules and links to line numbers of a CSS sheet if it detects any media rules have been used.

ff 33 style editor

Firefox 33 For Android

Clear Data When You Quit Firefox

Each time you quit Firefox, you can now delete all your data with it. The feature can be found under Settings>Privacy and you can select what data to delete. Once set, Firefox will remove data for the items you’ve selected.

ff android clear data ff clear data


Paint Flashing

This feature has been added in both the desktop and the Android versions of the app. Before we go into any details, take a look at what the feature looks like in action on both platforms.

ff 33 desktop paintflashing

ff paint flashing android ff android paint flashing

To activate paint flashing on the desktop, open the Developer toolbar and type ‘Paintflashing on’. To activate the feature on Android, go to Settings> Developer Tools and check the Paint Flashing option. What this tool does is that it highlights which parts of a page may have been repainted by actions such as hovering the cursor over a page element or scrolling. It makes it easy to spot if the browser is having to repaint a page more than is needed.

For more details about the new changes, read the release notes for Firefox 33 for desktop and Android. The biggest addition for end users is no doubt on the Android version where better security and the ability to stream video to Chromecast and Roku have been added.

Download Firefox 33 For Desktop

Download Firefox 33 For Android


  1. I usually have updates turned off since it seemed to play havoc with the add-ons staying officially compliant when there were updates every month. Somehow it snuck the update to 33 in on me and BAM, session restore didn’t work right out of the gate. I have had multi-level restores (on of restored windows contains another restore sessionj option etc) work in the past and now it works12% of the time (1 in 8 so far). had to result to bookmarking all tabs when I remember, just in case. And why does it look so different than in this articl? I now have big clunky tabs and the top bar takes up way too much space. guess I have to research how to get lower profile tabs.

  2. Firefox on Android is awful. It’s slow, lags, and the navigation is far worse than in Opera. The only nice thing it has is the plug-ins option.

    • I use the nightlies, which are currently at v36.0a1 and find Firefox to be the fastest browser on the desktop.

      On mobile, it’s a different story. Slow, bloated and horrible. Opera mobile works very well though.

    • I did find a solution, in my case I needed to turn Auto Proxy to No Proxy, Volia! Speed!

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