This is how to install Adobe Flash Plugin for Firefox:
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Go to https://get.adobe.com/flashplayer/ and select the option .tar.gz for other Linux. Download the file.
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Unpack the tar.gz file. Once unpacked you will see the following: libflashplayer.so /usr
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Identify the location of the browser plugins directory, based on your Linux distribution and Firefox version.(Usually it is /usr/lib/mozilla/plugins/ or /usr/lib/firefox/browser/plugins)
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Copy libflashplayer.so to the appropriate browser plugins directory. At the prompt type:
sudo cp libflashplayer.so <BrowserPluginsLocation>
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Copy the Flash Player Local Settings configurations files to the /usr directory. At the prompt type:
sudo cp -r usr/* /usr
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Now restart your browser.