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Apart from installing a different (potentially less stable) browser, you really don't. Just like you can't sideload on iOS unless you jailbreak or do weird workarounds.
Source
These extensions provide an alternative to the walled garden model. You can run all kinds of scripts with them that very from tiny tweaks to web pages, to larger projects that are essentially extensions themself. One of the ones I use, MALSync, actually is one. It's available as a userscript OR a proper extension.