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Many websites and online services offer two-factor authentication (2FA) using SMS or using a Time-based One-Time Password (TOTP) application (some services also offer an email link, but I will not cover it here, although it also adds security in a similar way). It is highly recommended to use two-factor authentication to sign in to websites. It adds one layer of information besides the password, which makes signing in to online websites a bit more secure. The only way someone can get into your account is if they acquire both your password and the secret key on your phone. I prefer TOTP over SMS, because SMS is sometimes more unreliable and slower. (I won't discuss which method is more secure; there are potential vulnerabilities in both use cases depending on device and platform) Time-based One-Time Password A Time-based One-Time Password algorithm calculates a one-time password from a shared secret key and the current time. It is a standard described in RFC 6238 . It re

Firefox Tracking protection is a great feature used in Private browsing mode. But turning on Firefox tracking protection permanently has several benefits. According to researchers it makes pages load 44% faster and reduces data usage by 39%. You will also get rid of most personalized advertisement, thus the increased performance. Personally, I prefer to choose my advertisement myself. You can turn on the feature in Firefox by typing about:config in the location bar and hitting enter. Type and find privacy.trackingprotection.enabled and double-click it to toggle it to true. But how to turn this feature on for all users on the same PC ? Usually family members are not tech-savvy enough to mess around in the Firefox configuration interface. Behold, if you are an administrator, you can set a machine-wide setting. You can tell Firefox to read system preferences by creating a file defaults/pref/local-settings.js in the Firefox installation directory. Then set the default preferenc

Fedora Copr is an automated build system with a repository as output. You upload the source, select desired build systems (Fedora, Redhat) and get one or more rpm packages in repositories automatically. There is now a Fedora 24 Copr repository for SleepyHead: https://copr.fedorainfracloud.org/coprs/johanh/sleepyhead/ This means you can install SleepyHead from command line with: sudo dnf copr enable johanh/sleepyhead sudo dnf install sleepyhead As long as the repository is enabled, you will also receive any updates to SleepyHead when updating your system with dnf update.