Add favicons to synchronisation

[A24]

Synchronizing favicons is a good thing. Chromium-based browsers have supported favicon synchronization for a long time. This is a fairly simple thing, but its presence affects the overall impression of the synchronization as a whole. The fact that Firefox still cannot synchronize favicons gives the impression that synchronization in Firefox is not fully developed, or was written before 1999, when favicons did not yet exist.

[Jon]

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[Jon]

Similar idea here: include favicons in synchronisation over mozilla account 

[Ford_Prefect]

Suggestion: Synchronisation of favicons is not strictly necessary, as Firefox could simply re-fetch missing favicons from there respective source.

[+] reduction of synchronized data
[+] implemented re-fetch method for favicons could then be used to also fetch missing favicons or to update favicons from time to time.

[-] massive traffic creation to website servers
[-] tracking of firefox users would become easier

[Luca_Pavan]

This thing that favicons are replaced with default ones just by clearing the cache or editing the bookmark/Home shortcut manually is annoying, it gives a bad look. What about a custom favicon scan interval or automatic check after a cache clearing or manual edit? The first idea can be useful for actions taken from both outside and inside the browser while the other 2 are good only for changes being made from inside Firefox. Clearly it's not a priority but it's certainly not good to see.