Step 1: Download and Install. This is clean and wouldn’t have any issues.
Step 2: It has a Firefox add on as well. And you might want to install that if you want to test on Firefox browser.
Once you launch the app, below is how the app would look like.
Click on Proxy and select “Mozilla Firefox Proxy”. Once you select this, your firefox proxy would get modified to use a manual proxy settings and look like below.
Once this proxy settings are enabled, then you can enable the Throttling (Use Control +T). Then click on the Throttle Settings which will open a pop up. In the new window you can select the different throttle preset like 3G or 56 kbps Modem etc. In case you want to limit it to a specific bandwidth, you can do so by entering directly the desired upload and download speed.
So in my case I selected the desired preset as 3G and was able to replicate the issue.
In case you want to try out some other browser, select the option “Windows Proxy“. This option sets the proxy at the OS level.