browser.major ​

Major version number of the browser (following semver↗), derived from the first number in browser.version.

• If the first token in browser.version is a number, then major is the first number (e.g 5.1.21214 would be 5)
• If the first token in browser.version is not a number, then major is "" (an empty string)
• If the browser has no browser.version, then major is undefined