First sentence: "Extract to a portable storage device..."
Looking at the first paragraph: "Extract to a portable storage device: Extract the installer to a portable storage device, such as a USB drive or external hard drive. Run the browser: Run the browser from the portable storage device, and you’re ready to go." portable firefox 52
Convenience
Replace "security patches" with "securityvulnerabilityfixes" First sentence: "Extract to a portable storage device
"Portable" can be replaced with mobile. Firefox is a brand, so stays. "52" is a version number, stays. "A" becomes the since it's an article. "Lightweight" could be slim. "Secure" → protected. "Browser" → web browser. "on the Go" → on move. portable firefox 52
"browsing experience" with "web navigation|online surfing|internet browsing"
"convenient" with "convenient|easy|accessible"