Setting up browser
Download and install
Chrome / Firefox
browser.Go to
Extensions
tab as it showed on screenshot.

Once u've opened it enable
developer mode
(step 4).Unzip your extension archive and just click load unpacked and select your folder with all extension files. To load it correctly you should use folder which directly contains manifest.json file, so it WON'T be like
folder (unpacked archive name) - folder (which actually contains files) - manifest and other files

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