Many websites do not have favicons that properly load into Orion (as with Safari), this can create an unpleasing favorites screen in which the icons are just a large letter. 
In the past I've used a script from GitHub to alter the images on Safari. However, a built-in solution to add custom icon images would be ideal.
At its simplest, dragging an image on top of the icon would be the most straight-forward method. Cropping mismatching aspect ratios could be a set default, as in 'cover' or 'fill'.
But that's still a hidden interaction, and if we're aiming for "Mac like", there needs to be a discoverable, menu based noun->verb interaction as the primary method. I propose making the 'Bookmarks' sidebar items selectable, and a menu item 'Edit' available in the 'Bookmarks' menu when applicable. The current 'Edit bookmark' dialog window gets an added image well for dropping/clicking on.
Right now, you can right click on the sidebar items, revealing options such as 'Rename' and 'Edit', but of course this contextual menu is also a secondary shortcut and doesn't quite make it. The primary method should be available in the 'Bookmarks' menu in the menu bar, making sure all actions can be achieved using just one mouse button.
(Edit: found the Bookmarks > Edit Bookmarks view, too; that covers the 'primary' case.)
TLDR; Select item in 'Bookmarks' sidebar and invoke 'Edit…' from 'Bookmarks' menu.
JonFabritius Thanks for thinking through it. It sounds like a lot of work for a feature that will be discovered by few and used by even fewer. I think we have more pressing things to do right now. This is sort of a 'cherry on top' feature.
Brief Summary
Allow users to personalize the user interface of their browser new tab section by allowing them to change the icons of their favorite websites icons. Some of the icon is auto-crawled from the website, which is nice but sometimes does not work (I am not able to identify the reason why some websites have icons loaded on my tab bar but never on my favourite bar.
Details:
This would allow users to create a more visually appealing and customized browsing experience by replacing the default icon (mostly only mono-color abbreviation letter) to unique icons they find in other places. It will make it much easier to visually identify what websites they are, thus higher efficiency when browsing.
Image/Video:
orionlover I believe this was suggested before. Cna you try to find it so I can merge the threads?
Vlad Sorry Vlad, I tried to find it but didn't make it.
also some favicons in bookmark bar don't look the way they should. For example favicon on github.com must be white when the system theme is dark. This works fine in brave, arc, chrome etc. But in Orion favicon is black, when the theme set to dark. The icon blends in and you can't see it, it looks bad.
KarmicDude This should be a separate bug report.
Another reason why custom favorite icons would be nice: Some icons, for some reason, are very low resolution. As someone who wants his browser UI to always look "good", this is quite annoying.
Here is an example. Interestingly, the icon for YouTube looks great in Safari, but is very pixelated in Orion. Re-adding to favorites did not solve this issue.
sutterseba can you show steps to reproduce this from a clean new orion profile?
Vlad Just tried it a few times with clean profiles. 3/4 times the (YouTube) icon was in full resolution. The fourth time, weirdly enough, was again pixelated.
Is there some sort of cache I can clear on my main profile such that Orion has to fetch the icons again?
I have a pixelated YouTube icon as well
