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firefox-qr
This is a project to get a qr code of the current url. Almost the same as the https://github.com/smoqadam/url-to-qrcode-firefox-addon extension for Firefox
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See the above comment, an addon is already available with open source code. It is minimally implemented to do just the task and works offline. Perfectly safe and recommended. The dev even commented above :)
For 1. you can use Panorama Tab For 9. you can use this https://github.com/FilipePS/Traduzir-paginas-web
Some discussion at GitHub - Mozilla / Standards-positions / Scroll To Text Fragment.