Firefly - Turn your firefox into Windows file manager
Firefly is a Firefox extension that can turn Firefox into Windows file manager.
There are many features which Windows file manager can’t provide. For example, Firefly allow user to split/add the view for more comfortable work. You can use Firefly to copy, paste, and cut your files from one folder to another folder. Rename/create new folders can also be done through Firefly.

Firefly allow user to preview audio/video, pdf, and image, but you need to install the VLC player plugin. You are not advised to open more preview because this will crash your Firefox (VLC player problem).
I like this plugin because i can use Firefox to perform more tasks as i don’t need to open another window (file manager) for just to manage my files. But, this plugin’s size is quite big (more than 2MB). Such a heavy plugin will crash your Firefox if your system memory not enough. So, i advice you to create another profile before you install this plugin, so that you can switch to your original profile if anything happen to your Firefox.
Popularity: 16% [?]
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The start of the post excited me so much that i put the plugin directly to download, but in the end, came to know its 2 MB, man, its really too heavy, and what it has done to my firefox, i cant explain. It is a great plugin, but it has its own flaws.