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Bookmarlet: Take number from end of URL and put it in a new URL?

I want to create a bookmarklet that will take something like this;
http://www.site1.com/some/random/path/12345
And change it into this, then reload the page;
http://www.site1.com/new/path12345?value=true
Unfortunately I haven't tried much, because I know absolutely nothing about Javascript. I tried to copy a bit of code that does a search and replace on the URL and then tried to add the functions for appending a string, but that didn't work because I had no idea what I was doing or even the proper syntax I was supposed to use. Javascript seems to have about a dozen different ways to alter the current URL and I have no idea when to use each one.

try this,
var urlArray = [];
var myURL= http://www.site1.com/some/random/path/12345;
urlArray = myURL.split('/');
var newURL = "http://www.site1.com/new/"+urlArray[urlArray.length-2]+""+urlArray[urlArray.length-1] +""+"?value=true";
var myPageLink = document.createElement('a');
myPageLink .setAttribute('target', '_blank');
myPageLink .href = newURL;
document.body.appendChild(myPageLink );
myPageLink .click();

Change an element of a website using a script?

OBSERVED BEHAVIOR
I am using a website that displays a location on the page.
Example: San Francisco, CA \ Orlando, FL \ etc.
Like the text in the above example the location is static
and does not do anything.
<span class="userinfo2015-basics-asl-location">Orlando, FL</span>
To bring more life to the page and add functionality to that location, I installed GreaseMonkey which allows a user to create scripts that modifies the functionality of a page. Unfortunately the script was outdated and didn't work. But the code seems to be on the right track.
var locE = document.getElementById('span.userinfo2015-basic-asl-location');
var location = locE.textContent;
var newSrc = "https://www.google.com/maps/place/"+location;
var link = document.createElement('a');
link.setAttribute("href",newSrc);
link.setAttribute("target","_blank");
link.innerHTML = location;
locE.parentNode.replaceChild(link,locE);
EXPECTED BEHAVIOR
The GreaseMonkey script would make the static location that you saw above into a link that redirects you to Google Maps.
RELEVANT INFORMATION
Using Greasemonkey Version 3.8
Using FireFox Version 47.0

Some things to correct:
To find the element you should in your case not use getElementById, as that would need an id. Instead use querySelector;
the class name you specify is not the same as in the HTML code: -basics- has an s at the end;
don't use location as a variable name, as that is a reserved property of the global object. Use something like newLocation;
when adding a string to a URL, special characters (like &, / and =) should be escaped. You can use encodeURIComponent for that;
not really an error, but it is better to assign text to textContent than to innerHTML, as it not really is HTML you are assigning.
// use querySelector
var locE = document.querySelector('span.userinfo2015-basics-asl-location');
// don't use location as variable name.
var newLocation = locE.textContent;
// use encodeURIComponent
var newSrc = "https://www.google.com/maps/place/"
+ encodeURIComponent(newLocation);
var link = document.createElement('a');
link.setAttribute("href",newSrc);
link.setAttribute("target","_blank");
link.textContent = newLocation; // use textContent
locE.parentNode.replaceChild(link,locE);
<span class="userinfo2015-basics-asl-location">Orlando, FL</span>

It should work with a few changes:
It looks like you misspelled your class name.
You need to use getElementsByClassName()[0] to get an element by class name.
I had some trouble getting this to work in the snippet, but I got it to work in JSFiddle:
JSFiddle: Span to Link
Here's the modified JavaScript:
var locE = document.getElementsByClassName('userinfo2015-basics-asl-location')[0];
var location = locE.textContent;
var newSrc = "https://www.google.com/maps/place/" + location;
var link = document.createElement('a');
link.setAttribute("href", newSrc);
link.setAttribute("target", "_blank");
link.innerHTML = location;
locE.parentNode.replaceChild(link, locE);

Bookmarklet/JavaScript to rotate URL

I want to create a Bookmarklet which will load one link out of a list of ten links, order doesn't matter, but weight-age does.
I tried http://www.htmlbasix.com/textrotator.shtml but it's for rotating a link on a webpage, how to make a Bookmarklet which will open a random URL from the list? Kind of URL rotator script within a bookmark.
Any efficient way to do that?
Thanks in advance.

You can't setup bookmarklet to run automatically. Consider writing browser extension or just use curl.
Not automatically.
Then it varies.
First, if you're 100% that pages don't redirect you anywhere you can try to use window.location inside you bookmarklet in next way:
var next = urls.indexOf(window.location.href) + 1;
next = next < urls.length ? next : 0;
window.location = urls[next];
If one of pages redirects or messes with url then you can use localStorage on your own domain and postMessage to store any data between bookmarklet calls.

I have found the solution after few tries
javascript: (function randomlinks() {
var myrandom = Math.round(Math.random() * 9);
var links = new Array();
links[0] = "http://www.javascriptkit.com";
links[1] = "http://www.dynamicdrive.com";
links[2] = "http://www.cssdrive.com";
links[3] = "http://www.codingforums.com";
links[4] = "http://www.news.com";
links[5] = "http://www.gamespot.com";
links[6] = "http://www.msnbc.com";
links[7] = "http://www.cnn.com";
links[8] = "http://news.bbc.co.uk";
links[9] = "http://www.news.com.au";
window.location = links[myrandom];
})()

Change URL params or remove some part of URL with jquery

I have this URL and wanting to know how can I remove this section from it via a jQuery event.
Need to remove:
&activities_id=13&session_id=14&back=1
Original URL:
http://somedomain.com/ijob-css/index.php/search/default/index/area/act?query=&activities_id=13&session_id=14&back=1
EDIT
Sorry i think i havent included the most important section. I should change the Address BAR url not a normal string.
for example, if i have this url in the address bar - http://somedomain.com/ijob-css/index.php/ after change, address bar should contain http://somedomain.com/xxx=111, without page refreshing.

Do you mean you want the URL without the query parameter part? If then see if this helps.
var test = 'http://somedomain.com/ijob-css/index.php/search/default/index/area/act?query=&activities_id=13&session_id=14&back=1';
alert(test.substring(0, test.indexOf('?')));
If you want until first query parameter name then just seek until index of &
Update :
If you are using HTML5 then what you ask is possible. Check browser history manipulation. You can find details about this here.
I believe replaceState() is the answer for your problem. However it is not supported in all browsers/versions. History.js wraps HTML5 state features and provides additional support for HTML4 browsers.

Try this out
var new_url = old_url.substring(0, old_url.indexOf('&'));
Example: http://jsfiddle.net/SjrqF/
var url = 'youtube.com/watch?v=3sZOD3xKL0Y&feature=youtube_gdata';
url = url.slice( 0, url.indexOf('&') );
or:
Example: http://jsfiddle.net/SjrqF/1/
var url = 'youtube.com/watch?v=3sZOD3xKL0Y&feature=youtube_gdata';
url = url.split( '&' )[0];

var lastPart = 'query=';
var url = 'http://somedomain.com/ijob-css/index.php/search/default/index/area/act?query=&activities_id=13&session_id=14&back=1'.split(lastPart)[0] + lastPart;

var index = original_url.indexOf("=");
var new_url = original_url.substring(0,index+1);

See below.
var positionToSubstring = this.location.href.indexOf('&');
var newURI = this.location.href.substring(0, positionToSubstring);

use this
var test='http://somedomain.com/ijob-css/index.php/search/default/index/area/act?query=&activities_id=13&session_id=14&back=1';
test=test.split('&')[0];
console.log(test);
outputs
http://somedomain.com/ijob-css/index.php/search/default/index/area/act?query=

Browser Extension - How to get the current page's URL

I am making a custom button. When I click that,it should show the "current page's URL".
I found the answer as "document.location" or "windows.location" . But, both points to the local XUL location "chrome://browser/content/browser.xul" not the original URL. Can anybody show how to accomplish this?

Try anyone of these.. One should definitely work,
window.top.getBrowser().selectedBrowser.contentWindow.location.href;
window.content.location.href
function getURL{
var currentWindow = Components.classes["#mozilla.org/appshell/window-mediator;1"].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow("navigator:browser");
var currBrowseSession = currentWindow.getBrowser();
var currURL = currBrowseSession.currentURI.spec;
return currURL;
}