User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20180106205129 Steps to reproduce: open local site with favicon: http://feelsafe:3000/favicon.ico It looks like the favicon is cached and can not be purged from that cache. Even CTRL+SHIFT+R do no help Actual results: The wrong favicon is displayed on tab Expected results: The right favicon should be displayed

[this answer helps](https://stackoverflow.com/questions/8616016/favicon-not-displayed-by-firefox) I clear places.sqlite

Also after visiting http://feelsafe:3000/favicon.ico when I restart firefox it helps. The icon is refreshed

Icons are no more stored in places.sqlite from at least Firefox 55. They are now stored in favicons.sqlite Favicons are also expired after 7 days, not immediately, as you noticed refresh (even forced) doesn't change that, that's a longstanding bug. Firefox 58 has some fixes for favicons and may help, but it won't still refresh icons on request.

this makes hard while site developing. There should be button to drop cached favicons

You can use PlacesUtils.favicons.expireAllFavicons(); from the Browser Console.

We have several reports about a similar issue: for our website we have several static png images for favicon: - 0.png - when there are no unread messages - 1.png - when there is only 1 unread message - 2.png - when there are 2 unreads and so on Usually a usecase looks like this: - user has 0 unread - favicon is <link id="png16favicon" rel="icon" type="image/png" href="/0.png" sizes="16x16"> - he gets a new message - we remove previous <link/> and add a new one - <link id="png16favicon" rel="icon" type="image/png" href="/1.png" sizes="16x16"> - when he reads the message - we change favicon back to <link id="png16favicon" rel="icon" type="image/png" href="/0.png" sizes="16x16"> by removing current <link/> element and replacing it with a new one that points to 0.png - the result is like this <link id="png16favicon" rel="icon" type="image/png" href="/0.png" sizes="16x16">. Expected result: we see image that corresponds to 0.png Actual result: we see image that looks like 1.png ======= It is not 100% reproducible. We got it once and we could reproduce it several times even after FF reload. But after loading FF without AddOns - it went away. When we loaded FF with AddOns again - it is not reproducing as of now.

> You can use PlacesUtils.favicons.expireAllFavicons(); from the Browser Console. any recommendation what can be suggested to final users that are experiencing this problem?

> You can use PlacesUtils.favicons.expireAllFavicons(); from the Browser Console. This didn't work in our case. We still see wrongly "cached" favicon image.

Here is an example of "cached" favicon problem

Browser version: firefox=58.0.2+build1-0ubuntu0.16.04.1 After running PlacesUtils.favicons.expireAllFavicons(); and browser restart - actually all seems to work for some time at least.