Bugzilla

As there are a number of issues still at play here, I've broken this issue out to the following issues:

> I've got 4 pink icons for 2 different urls.

https://bugzilla.mozilla.org/show_bug.cgi?id=1863717


> The screenshot in Jump Back In is for the Vox tab but the name and URL is for the support article.

I believe this is covered by https://bugzilla.mozilla.org/show_bug.cgi?id=1844750

This ticket partially fixes:

> Sometimes, favicons and images that were present before are missing and then get reloaded or images are replaced by similar but different images.

As there are a number of issues still at play here, I've broken this issue out to the following issues:

> I've got 4 pink icons for 2 different urls.

https://bugzilla.mozilla.org/show_bug.cgi?id=1863717


> The screenshot in Jump Back In is for the Vox tab but the name and URL is for the support article.

I believe this is covered by https://bugzilla.mozilla.org/show_bug.cgi?id=1844750

> Should also look into the color selection algorithm to make sure we're spreading colors out evenly across placeholder icons, rather than 'randomly' (meaning: would be nice to avoid duplicating colors)

https://bugzilla.mozilla.org/show_bug.cgi?id=1863720