403 Forbidden error in Firefox only, works in Chrome and Safari

I have a Firefox quicksearch bookmark that runs a Maxmind query. This worked until recently. I type 'ip 82.176.230.15' (for example) into the URL bar and it queries Maxmind to retrieve the location of the IP:

http://www.maxmind.com/app/locate_demo_ip?ips=82.176.230.15

Within the past week, for reasons unknown, I now get a 403/Forbidden error when I try to access Maxmind.

"You don't have permission to access /app/lo开发者_JAVA百科cate_demo_ip on this server"

Strangely, the same URL is accessible in Chrome and Safari. I can also access the same URL with Firefox, Chrome, or Safari on my Mac.

I've deleted all cookies, disabled all addons, and still can't get it to work. Any idea what could be happening? I know that the 403 has to come from the server, so I don't know why it would work in other browsers. And it's been going on for days, definitely not some glitch on their server.

---

Get an HTTP debugger like firebug or fiddler (not sure that will work with FireFox, but probably if you set it up right)

Look at the difference between using your quick bookmark and just typing the URL. The server could return 403 whenever it feels like -- see if there's any difference, and what it is.

---

I recently had the same issue and was able to fix it. In my case the problem was in headers that Mozilla sent. Particularly it was because of header:

"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0"

What makes web-site refuse connection is this part of string "(X11; Ubuntu; Linux x86_64; rv:100.0)" and i have no idea why.

I found a nice solution, you can change Mozilla settings to include other browsers in this header (Chrome and Safari) and it could make sites with this problem works.

Here is how to do it:

1. Type about:config into the URL bar. Press Enter.

2. Create a new entry with key=general.useragent.override and add this string there Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.115 Safari/537.36. I found that Google Chrome uses this string as User-Agent header probably to prevent such issues. So you should see something like:

   

3. Now save this settings and go reload your page, it should work now