Browser Add-on development to convert Youtube WL to playlist - browser

I need some advice on how to start developing an add-on for a browser. I want to implement something into Youtube that accesses a user's profile in order to get to their playlists. I'm not looking for an add-on that helps to develop things, but to directly program an add-on itself, but I'm not sure where to get started. Any advice is appreciated, thanks!

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Is there a way to get audio from spotify

So I'm Working on a NodeJs project and am wondering if there is a way to get audio from Spotify Like you Input a song URL and It plays the track, I've looked all around and can only find stuff for the web browser, I don't know if they even have a way. If there is any info about this please let me know.
You'd have to make calls through the Spotify API.
You can read more about the API here: Spotify API Documentation
This is a node.js specific library that you may also want to check out:
thelinmichael's node.js Spotify API Library
The answer provisioned and marked as correct is wrong.
The only way you can extract audio is by using a Windows VM, connect via RDP. Run a script to play Spotify programatically and record the audio.
Since this is the only solution. It is not possible to query data from Spotify.

How to access Google Classroom without API?

I'd like to automatize some processes that are not yet available through API(Google Classroom), like posting comments on announcements, seeing private comments on my work and so on. I have trouble accessing my account. I'd like the app to be able to run on a server. I'm currently working with node.js, but if there is an easier approach I'll gladly accept it (free if it's possible). Can you give me an example of how it's done because currently, I am struggling to find every button that needs to be clicked on?
Unfortunately, there are no methods right now to accomplish that. You can leave a feature request on Google Issue Tracker describing what methods you would like to use. Google engineers will study your case and, if applicable, they will develop the requested methods.
You could use something like Selenium with your language of choice (Javascript in this case) to automate the browser clicks.
This is however, not the best of ideas... To make Selenium log into your account you will need to hardcode your password somewhere.
Google services use Oauth for authentication, take a look at the Classroom API Getting-started for instructions on how to work with Google Classroom API.

Take panoramic photos in Android

I want to make an Android application that allows the user to take panoramic pictures... I have been searching for several hours for some library or some sample code or tutorial but I didn't find anything very interesting. Some applications like "Cardboard camera" or the standard Android camera can do this! Is there a way to call these application functions? Or some API? It still would be good if the app I want to make just would use an external app to take the photo. Please help me, thank you :)

Integration : Chrome web store and slack

I was searching for a way to get some information from chrome webstore (I have couple of extensions there) specifically feedbacks from users and user count. And I would like to do something with that data.
I searched about chrome web store API
but couldn't find anything.
found launchkit which does same thing, but for appStore
I am thinking there is no straight way to do it, but if anyone has done it or got some idea about it please share it along,
Thanks in advance
A simple google tells me there are already some possible helpful answers:
Get user feedbacks
How to get user feedback/bug reports on a Chrome Extension through itself?
Get user count
API call for user count in Chrome Web Store?
The closest I can find out is chromebeat and my extensions I would have to figure out how this works without an existing API and write my own after that I guess.

Google Plus Screenshare

I was hoping that someone knows a little bit more about Google Plus's in-browser screensharing capabilities. The flow obviously is:
Download some sort of native plugin
Visit the website
Some magic
Bam! There is screenshare
What exactly is going on with the plugin that is downloaded? Where can I look to build a system that works similarly?
All online resources point to taking a screenshot of a person's screen and creating a MJPEG, and we all know that's no fun.

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