Bookmarklet to jump on JIRA issue in current tab. Make sure, you put your's JIRA workspace name.

bookmarklet_jump_to_jira_issue.js

javascript: (function() {

    var issueCode = prompt('Issue code:');

    if (issueCode) {
        var url = 'https://<YOUR JIRA WORKSPACE>.atlassian.net/browse/' + issueCode.trim();
        window.location.href = url; /*redirect*/
        console.log('JIRA opened URL:', url);
    }

})();