I think that code lack of comments (jsdoc) thus hard to understand. Maybe should consider adding them at least for classes and public methods as part of project code-style?

Is your feature request related to a problem? Please describe.

Hard to understand what code does.

Describe the solution you'd like

JSDoc classes and public methods.

Sidebar shouldn't open/{get switched to}/.. at that time .

There are many websites, where this add-on may fail to work properly. They are reported with the label "site-issue".
If you know some arcane ones or just want to play around a little, feel free to please test this on as many sites as possible.

If you find a bug…

…please open a new issue -> "Problem with a specific website". Fill out the template as stated.
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Apple announced at WWDC 2020 that Safari will support WebExtensions! FINALLY!!!!!

Get 2FA Notifier working on Safari.

There was little effort put into the design of this extension tbh, so feel free to chop away. 🌷