Installing Thunderbird for OpenBSD 5
The Unix Tutorial shows you Step-by-Step How to Install Mozilla Thunderbird e-Mail Client for OpenBSD 5.2/5.3/5.4/5.5/5.6 Unix Desktop.
OpenBSD is well known for its Security Features:
Security-related APIs & Warning when Unsafe string manipulation Functions
Memory Protection
Cryptography and randomization

Login into OpenBSD Shell.
How to Set the Packages Repository Mirror.
Here OpenBSD Find Packages RepositoryPlease Donate $1 to Remove Ads!OpenBSD Exact Command to Find Repository URL for Getting Installed New PackagesInstalling the Thunderbird eMail Client.
Copysudo su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Copypkg_add -v thunderbird
How Install Google Chromium Browser for OpenBSD
Here OpenBSD Chromium Installation
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Link to Guide on Installing the Chromium Browser for OpenBSD Unix