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Firefox issue - F5 VPN plugin or addon not installing onFirefox running on Thinpro

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How to Add or install the F5 VPN plugin or add-on to the Firefox running on Thinpro or Linux OS. While try to continue with installation, it throws error The add-on could not be downloaded because of a connection failure on

While try to download and install manually it's also not successful as it comes in the .tgz format

Is any one tried this earlier and any steps can share is appreciated.

How to Add or install the F5 VPN plugin or add-on to the Firefox running on Thinpro or Linux OS. While try to continue with installation, it throws error The add-on could not be downloaded because of a connection failure on While try to download and install manually it's also not successful as it comes in the .tgz format Is any one tried this earlier and any steps can share is appreciated.

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Error screen shot