Firefox

Firefox is a free and open-source web browser.

List of useful Firefox addons

ClearURLs removes tracking elements from URLs.
Dark Reader creates an automatic dark mode for sites without native dark mode.
Firefox Multi-Account Containers lets you separate cookies in different containers on a per site base.
Floccus syncs your bookmarks across devices (supports Nextcloud and WebDAV (ownCloud, etc)).
hide-scrollbars hides scrollbars.
Never-Consent automatically refuses GDPR consent to a bunch of platforms.
NoScript blocks all javascript so that the parts you need can be reenabled and the rest is not used.
Privacy Badger blocks unwanted invisible trackers.
Temporary Containers opens tabs and websites, that are not already managed by Firefox Multi-Account Containers in a new container.
Tree Style Tab shows tabs like a tree. This is especially useful if many tabs are used.
uBlock Origin blocks unwanted content like ads.
User-Agent Switcher and Manager spoofs websites that try to gather information about your webbrowser.
Vim Vixen enables vim movement for firefox.

You can add a new search engine with the addon Add custom search engine. Make sure to replace <url to search engine> with the according url.

It is possible to add it without an addon. Navigate to the search engine and click the ... in the address bar. Then click Add Search Engine