If in between your Kali Linux shenanigans, you happen to pause for a break, open Youtube, or Spotify Web Player and notice that you don't have Adobe Flash Player installed. Kali Linux, by default, has "iceweasel" installed, which is a fork of Mozilla Firefox for Kali Linux, to install it on iceweasel or Firefox:

First, know if your Kali Linux is 32-bit (x86) or 64-bit (x86-64):
1. In the upper right corner, go to "All settings".

2. Click on "Details".

3. Check in ?Base System?, if you are x64 0 86.

Once this is known:

1. Go to the Adobe website and download the version for you (32-bit or 64-bit) and choose "Flash Player XX.X for other Linux" (.tar.gz).

https://get.adobe.com/es/flashplayer/

2. Once the file is downloaded, we must decompress it, and as always, there are two ways:

2.1 We enter to our files, specifically in the folder of ?Downloads?, right click and ?Extract here?
2.2 From the terminal (I am root user), go to downloads:

cd /root/Downloads/

*If you are not root user, in the terminal type:

your

And it will ask you for the root password, by default it is ?toor?, but if you installed it, it asked you to enter a root password, and that is the one you have to enter.

2.2.2 Once located in Downloads, type:

tar xzvf install_flash_player_11_linux.x86_64.tar.gz

Or the current version.

3. Anyway you have unzipped the file, inside the ?Downloads? folder you will now have the folders ?usr?, ?LGPL?, a file called ?readme.txt? and another called ?libflashpayer.so(we can check it from the explorer or in the terminal, located in downloads with the ?ls? command).

Now we have to move the file ?libflashplayer.so? to the path ?/usr/lib/mozilla/plugins/?, for that we have the same two ways:

3.1 From the ?explorer? or graphical interface, cutting the file (Ctrl+X or right click, cut) and pasting it in the location ?/usr/lib/mozilla/plugins/?, (Mozilla and not iceweasel because as I said at the beginning, it is a fork of Mozilla) if you do not know how to access it, in the same explorer, on the left side, in the option ?Other locations?, ?Equipment?, you will be able to find the folders that the route indicates.

3.2 From the terminal, typing:

cp libslashplayer.so /usr/lib/mozilla/plugins/

With this, it is enough to restart your browser. One way to find out if you already have Adobe Flash Player installed is by going to http://www.adobe.com/es/software/flash/about/ where it will come out:

Or it will tell you that you don't have Adobe Flash Player installed.

Additionally, you need to copy some icons for the system, these will not affect its operation, but it is not superfluous to put them in your Kali Linux. This is done as follows:

1. Inside the "Downloads" folder (if you unzipped it there), there will be the "usr" folder, which contains 4 folders called: "bin", "lib", "lib64" and "share". These correspond to the folders in your file explorer in the path ?/usr/? (in explorer: other locations -> Computer -> /usr/).

2. You must copy each of the files from the ?Downloads/usr/? folder to the corresponding folder of the same name inside ?/usr/? on your hard drive.

This completes the installation of Adobe Flash Player on Kali Linux.