View the source code of a 3rd party plugin?

I have added a plugin to my WordPress site. How can I get the source code of this plugin?

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Here are some ways how we can view the .php source code for plugins:

1) via wp-admin access:

Visit the Plugins page and press the Edit link beneath the plugin name.

For example if we want to check out the bbPress source:

enter image description here

this link will take us to:

/wp-admin/plugin-editor.php?file=bbpress/bbpress.php

We can also visit the /wp-admin/plugin-editor.php page and select the plugin to edit.

But this will not work if we got:

define ( 'DISALLOW_FILE_EDIT', true  );

in the wp-config.php file.

I don’t recommend editing plugin files through this editor. If we break something, we might not be able to access it again through the admin pages.

2) via server access:

On the server hosting our files, we most likely find the plugins under:

/path/to/your/wordpress/wp-content/plugins/

Note that it’s possible to rename the wp-content directory through code.

We might need to access the server via ftp, sftp, ssh or through some web file managers.

3) via wordpress.org:

If the plugin is avialable on wordpress.org, we can check out the developers tab.

For bbPress the path is:

https://wordpress.org/plugins/bbpress/developers/

and here’s the screenshot:

bbPress code

4) via GitHub/BitBucket/… repositories:

Many plugins are available on GitHub or Bitbucket. Even mirrors for the wordpress.org plugin SVN repository.

5) via the .zip file:

If you have the .zip file, you can open it and view the source files from there.

ps: bbPress was just a random plugin that I used for demonstration.