[jasomill]

Safari, not Chrome, but here's an AppleScript I use to map a trackpad gesture to the "next page" link on a wide variety of Web sites,

    tell application "Safari" to do JavaScript "
        (() => {
            const loc = Array
                  .from(document.querySelectorAll('[rel=\"next\"], .next, [title=\"Next page\"]'))
                  .map(i => i.getAttribute('href')).filter(i => i)[0];
            if (loc) {
                document.location = loc;
            }
        })()
    " in document 1

s/next/prev/g s/Next/Previous/ for the matching "previous page" script.

Note that this requires Safari's "AllowJavaScriptFromAppleEvents" preference to be set, either via a "Develop" menu option or directly in its preferences file via, e.g., the

    defaults write com.apple.Safari AllowJavaScriptFromAppleEvents -bool TRUE

shell command, and that this setting allows any program you authorize[1] to send Apple Events to Safari to potentially do Terrible Things. Given that the setting is both disabled and hidden by default, and additionally gated by an opt-in privacy preference, it's presumably an unlikely target for garden-variety malware, however.

[1] Check the Automation group in the Privacy tab of the Security & Privacy preference pane for a list of programs so authorized.