Customize Mascots (In error pages)

[remusao]

On some error pages (like when browser cannot load a page), a custom mascot is shown. For example: https://github.com/cliqz-oss/browser-f/blob/master/mozilla-release/browser/themes/shared/illustrations/error-connection-failure.svg

Maybe we could have Ghostery versions of those?

Example of place where this can be done: browser/themes/shared/aboutRestartRequired.css https://github.com/ghostery/user-agent-desktop/blob/8f59bd745702f7c76f97bc3d67472577824ac644/browser/themes/shared/aboutRestartRequired.css#L33

Or https://github.com/cliqz-oss/browser-f/blob/master/mozilla-release/browser/themes/shared/illustrations/error-session-restore.svg

I guess we can check everything in folder browser/themes/shared/illustrations/?

[chrmod]

Nice finding. Wonder why those assets are not in the theme. Probably because they are shared by all brands.

It would be interesting to check if brandings assets override this ones.

Anyways, it is nice to have.