RedditQuickPreview After loading the script, opens a frame or window when you hover over links. Exclusions are in regex. Usage: - Make a bookmark with code, with a prefix of "javascript:". So your bookmark will look like "javascript:(function....." - Click that bookmark whenever you want to load the script.

gistfile1.txt

(
    function () {
        "use strict";
        /*global window, document, self*/
        var type = "window", /*frame or window*/
            exclude = /(pixel.reddit|irc:\/\/|reddit.com\/domain|\/compose|\/login|\/submit|\/password|\/gold|reddit.com\/user|reddit.com\/r\/[^\/]*\/?$)/i,
            a = document.getElementsByTagName("a"),
            myrdiv = document.createElement("div"),
            myrframe = document.createElement("iframe"),
            i = 0;
        try { document.getElementById("content").style.margin = "0px"; } catch (e) {}
        function resizeframe() {
            myrdiv.style.width = (window.innerWidth - 720) + "px";
            myrdiv.style.height = "98%";
        }
        window.onresize = function () {
            resizeframe();
        };
        myrdiv.id = "myrdiv";
        myrdiv.oncontextmenu = function () {
            myrdiv.style.display = "none";
        };
        myrdiv.style.zIndex = "999";
        myrdiv.style.background = "rgba(255,255,255,0.75)";
        myrdiv.style.position = "fixed";
        myrdiv.style.top = "0px";
        myrdiv.style.left = "600px";
        myrdiv.style.paddingLeft = "100px";
        myrframe.id = "myrframe";
        myrframe.style.border = "1px black dotted";
        myrframe.style.zIndex = "999";
        myrframe.style.width = "100%";
        myrframe.style.height = "100%";
        myrframe.style.webkitTransformOrigin = "0 0";
        function zoom1() {
            myrdiv.className = "zoom1";
            myrframe.style.zoom = 1;
            myrframe.style.webkitTransform = "scale(1)";
            myrframe.style.width = "100%";
            myrframe.style.height = "100%";
        }
        function zoom33() {
            myrdiv.className = "zoom33";
            myrframe.style.zoom = 1;
            myrframe.style.webkitTransform = "scale(0.33)";
            myrframe.style.width = "303%";
            myrframe.style.height = "303%";
        }
        function zoom50() {
            myrdiv.className = "zoom50";
            myrframe.style.zoom = 1;
            myrframe.style.webkitTransform = "scale(0.50)";
            myrframe.style.width = "200%";
            myrframe.style.height = "200%";
        }
        function zoom75() {
            myrdiv.className = "zoom75";
            myrframe.style.zoom = 1;
            myrframe.style.webkitTransform = "scale(0.75)";
            myrframe.style.width = "133%";
            myrframe.style.height = "133%";
        }
        myrdiv.onmousedown = function () {
            if (myrdiv.className.indexOf("zoom75") > -1) {
                zoom50();
                myrdiv.className = "zoom50c";
            } else if (myrdiv.className.indexOf("zoom50") > -1) {
                zoom33();
                myrdiv.className = "zoom33c";
            } else if (myrdiv.className.indexOf("zoom33") > -1) {
                zoom1();
                myrdiv.className = "zoom1c";
            } else if (myrdiv.className.indexOf("zoom1") > -1) {
                zoom75();
                myrdiv.className = "zoom75c";
            }
        };
        myrdiv.onmouseover = function () {
            if (
                (myrdiv.className !== "zoom33") &&
                    (myrdiv.className !== "zoom33c") &&
                    (myrdiv.className !== "zoom50c") &&
                    (myrdiv.className !== "zoom75c") &&
                    (myrdiv.className !== "zoom1c")
            ) {
                zoom75();
            }
        };
        myrframe.onmouseout = function () { zoom1(); };
        for (i = 0; i < a.length; i += 1) {
            if (!exclude.test(a[i])) {
                if (a[i].href.replace("#", "") !== window.location.href) {
                    a[i].onmouseover = function () {
                        if (type.indexOf("frame") > -1) {
                            resizeframe();
                            document.getElementById("myrdiv").style.display = "block";
                            zoom1();
                            if (document.getElementById("myrframe").src !== this.href) {
                                document.getElementById("myrframe").src = this.href;
                            }
                            return false;
                        } else if (type.indexOf("window") > -1) {
                            window.open(this.href, "myrwindow", false);
                        }
                    };
                }
            }
        }
        myrdiv.appendChild(myrframe);
        document.body.appendChild(myrdiv);
        myrdiv.style.display = "none";
    }
)();