To use these add-ons, you'll need to download Firefox.

Qqen
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Iceggiren i CSS/JS Inject

CSS/JS Inject sɣur Freiholtz

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Icegger-it Yatsu
sɣur Yatsu, 5 luni în urmă
Nice extension, easy to use, scripts are saved per page which is what I needed and the scripts run at page content load (ig on DOMContentLoaded event)
2 n yiceggiren