Javascript in 4chan 404 defeater

4chan 404 defeater is a Firefox extension used to auto refresh 4chan threads in Firefox until they 404 (without showing a 404 screen):
Website:
http://spacetaken.net/44d/

Firefox extension:
http://spacetaken.net/44d/4chan404defeater_0-4.xpi

Greasemonkey script:
http://spacetaken.net/44d/4chan404defeater_0-4.user.js

Inside that .xpi is chandefeater.js and it's identical to the Greasemonkey script. I've been using 4chan 404 defeater for a while and I don't know anything about Javascript.

I want to modify that .js so instead of the default (auto F5'ing turned off (unchecked) and refresh rate set at every 2 minutes), I want the default to be checked and 8 minutes.

From window.saveCookies, it evidently saves a cookie for each open tab, saving the scroll position (44d_scroll_pos), the F5 interval (44d_f5_rate), and whether auto F5'ing (44d_auto_f5) is on/checked/true or off/unchecked/false.

I can view those cookies in Firefox through Tools > Options > Privacy > Show cookies and doing a Search for 4chan.

If I edit the .js and change:
var autoF5Rate = readCookie("44d_f5_rate", 2);
to
var autoF5Rate = readCookie("44d_f5_rate", 8);
..that changes the default refresh rate to 8 minutes.

But if I change:
var autoF5 = readCookie("44d_auto_f5", false);
to
var autoF5 = readCookie("44d_auto_f5", true);
..it does nothing.

The terms "checked" and "auto_f5_checker" both appear 6 times in that .js

The term "document.getElementById("auto_f5_checker").checked" appears 3 times in that .js

I think it has something to do with "onlick" and ".checked"

I'm currently focuses on these portions of code:

unsafeWindow.updateAutoF5 = function(){
    var checked = document.getElementById("auto_f5_checker").checked;
    //stop or start auto f5ing
    if(checked)
        autoF5TimerId = setInterval('doF5()', 1000*60*autoF5Rate);
    else
        clearInterval(autoF5TimerId);
}

unsafeWindow.validateRate = function(){
    var field = document.getElementById("ref_rate_mins");
    autoF5Rate = parseFloat(field.value);
    if(isNaN(autoF5Rate)) autoF5Rate = 1;
    else if(autoF5Rate < 0.1) autoF5Rate = 0.1;
    field.value = autoF5Rate;        //update to possibly different-to-inputted value
    if(document.getElementById("auto_f5_checker").checked){
        clearInterval(autoF5TimerId);
        autoF5TimerId = setInterval("doF5()", Math.round(1000*60*autoF5Rate));
    }
}

window.saveCookies = function(){
    writeCookie("44d_scroll_pos", document.body.scrollTop);
    if(document.getElementById("auto_f5_checker")){
        writeCookie("44d_f5_rate", autoF5Rate);   
        writeCookie("44d_auto_f5", document.getElementById("auto_f5_checker").checked);
    }
}

How do I make it so auto F5'ing is turned on by default in that .js but can still be turned off by unchecking the box (created by window.controlNode)?

>>1

Install Greasemonkey and the Greasemonkey version of the script.

You can change it on the fly and see the results.

    var autoF5Rate = readCookie("44d_f5_rate", 6);
    var scrollPos = readCookie("44d_scroll_pos", 450);

That changes the default refresh rate to 6, and the default scroll position to 450 (which is where the first post appears if Adblock Plus is running).