Fix errors and warnings in browser console

[Nutomic]

There are various errors and warnings shown in the browser console, we should try to fix or silence them.

Firefox:

Layout was forced before the page was fully loaded. If stylesheets are not yet loaded this may cause a flash of unstyled content. [node.js:417:1](resource://devtools/server/actors/inspector/node.js)
Found a sectioned h1 element with no specified font-size or margin properties. More information: https://developer.mozilla.org/docs/Web/HTML/Element/Heading_Elements#specifying_a_uniform_font_size_for_h1 
The Notification permission may only be requested from inside a short running user-generated event handler. [voyager.lemmy.ml](https://voyager.lemmy.ml/)
Cookie “” has been rejected as third-party.

Chrome:

Blocked aria-hidden on a <option> element because it would hide the entire accessibility tree from assistive technology users. For more details, see the aria-hidden section of the WAI-ARIA specification at <URL>.
9046.client.js:2 Bad element for masonry: .post-listings-grid