While most web browsers support extensions and themes, or are about to, you will notice that they don't necessarily share the same capabilities.Google Chrome for instance has its fair share of extensions and while some of them are unique, it would not be all to difficult to create them for Firefox as well. The same cannot be said however for certain Firefox extensions as Google Chrome limits the capabilities of extensions far more than Mozilla's browser. This article offers a list of popular and powerful add-ons for the Firefox browser that will never be available for other browsers unless the company behind the browser improves the extension engine first. I encourage you to leave comments below to mention additional extensions that are unique to the Firefox browser.
Unique Firefox extensions
Only extensions compatible with the current stable version of Firefox, that is 35 at the time of writing, are listed. You will also only find add-ons listed here that offer a unique feature that cannot be replicated by other browsers and especially Google Chrome.
Some lesser known browsers may support one or the other feature though.
Private Tab
Private Tab - While most browsers support private or incognito modes, these are usually implemented as separate windows only.
This means that you will work with two windows, one regular and one private, which is not very comfortable. While you could theoretically only work in private browsing windows, it is not comfortable either depending on how you use the Internet.
Private Tab for Firefox allows you to switch any tab in the browser to a private one.
NoScript
I have to admit that I'm not certain on this one. NoScript is a Firefox security extension that blocks all scripts from being executed by default among other things.
Last time I read about the possibility of bringing this to Chrome, the author of NoScript stated that Chrome was not providing the functionality needed to make it happen.
Tile Tabs or Tile View
These two extensions allow you to tile the browser window to display multiple websites in a single tab. You can tile them as often as you like and get extensive options to customize the layout and save it as well.
Tile View and Tile Tab are both available on the Mozilla Add-ons repository.
Status-4-Evar
Status-4-Evar was designed initially to bring back the old status bar of Firefox that Mozilla replaced with the add-ons bar in Firefox 4.
Today, it can do a lot more than that but one of its features is to display a status bar in Firefox that you can add icons to again.
Hide Tab Bar with One Tab
Why display a tab bar if you only display a single tab in Firefox? If you like to browse one tab at a time there is no need to display a tab bar. This can also be useful for kiosk displays or presentations.
Hide Tab Bar with One Tab hides Firefox's tab bar automatically if there is only one tab open in the browser.
All-in-One Sidebar
All-in-One Sidebar extends Firefox's native sidebar with additional features and options. The default sidebar can be used to display bookmarks or the browsing history.
The extension adds to that Downloads, add-ons, page info and the error console, and lets you switch between those options quickly.
Tab Mix Plus
Tab Mix Plus is one of Firefox's most popular extensions. It adds lots of features to the browser, too many to list here.
One feature that is unique is that it can enable a multi-row tab bar in Firefox to spread tabs across multiple rows instead of using a scrollbar to display them.
Lightbeam for Firefox
The browser extension Lightbeam visualizes connections between web servers and sites that you visit in the browser. The most recent version comes with options to block resources right away in the browser.
Tree Style Tab
Tree Style Tab adds vertical tab management to Firefox. It uses sidebar space to display all tabs open in the browser.
The advantage of this method is that you can display more tabs at the same time that display more information compared to horizontal tabs.
FEBE
FEBE, which stands for Firefox Environment Backup Extension, allows you to backup all Firefox extensions with a single click.
Additionally, you may use it to backup custom data such as bookmarks, cookies, search plugins or userChrome files.
Theme Font & Size Changer
Use the extension to change the global font size and style of the Firefox user interface. If text is too hard to read, increase its size to improve its readability. Need more space? Decrease the text size.
Now You: Did I miss an add-on? Lets hear about it in the comments below.
Source: http://www.ghacks.net/2015/02/09/these-powerful-extensions-make-firefox-unique/
