Generally if you open a browser it should ask you whether you want to make it your default web browser.
I have internet Explorer, Chrome and Sleipnir installed on my computer.
I use Chrome for memory intensive tasks and I use Sleipnir because it has very easy to use tabs. Every time I switch between browsers, unless I uncheck the dialog box, the box asking if I want to save as my default browser always automatically appears when opening a browser that is currently not my default browser.
Otherwise, I am sure you can change it in the options area of your desired web browser.
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The one presented to you by default when trying to download it from a mobile browser.
Go to m.opera.com on the phone's default browser and install it.
As of Windows 10, the default Microsoft browser is Edge (codenamed Spartan while in production). Internet Explorer is still also present (Edge uses a new rendering engine which is not fully backward compatible with Internet Explorer; in particular it no longer supports ActiveX or BHOs).
A browser is a program that allows you to view the internet. The best browser is Google Chrome.
The most common symptom is noticing new programs that you did not install yourself. There are other signs as well such as having your default homepage on your browser changed, pop up ads without having a browser open, programs letting you know there are viruses on your computer but require you to purchase the program in order to remove them, and an abundance of processes running in the task manager.