I added a custom search engine that has a data URI icon (i.e. embedded base64, not a url link).
The icon displays fine in both the dedicated search bar and in the 'one-off' search bar at the bottom of the browser's navigation / address URL-bar droplist. However, the icon is missing from the one-off search bar on Firefox's home page (about:home).
See screenshot below:
This does not happen in custom search engines where the icon is linked using a url. In those instances the icons display correctly in all places. Icons also display correctly when adding non-custom search engines using the conventional built-in method. I'm therefore assuming that the missing icon is an Add custom search engine issue, rather than a Firefox issue. It may possibly be due to the fact that the icon being used is a vector image (SVG) instead of raster image (PNG).
I have repeated this problem by creating new search engines with different SVG icons using base64, and each time the icon is not displayed on the Firefox home page one-off search (while displaying correctly everywhere else).
Here is a link to an example of the icon data of a missing icon (in case it's of use): https://pastebin.com/EhiQQXRK
That must be a Firefox bug considering the data: URL works correctly in other places. The correct place for reporting that bug to Mozilla would be: https://bugzilla.mozilla.org/home
I added a custom search engine that has a data URI icon (i.e. embedded base64, not a url link).
The icon displays fine in both the dedicated search bar and in the 'one-off' search bar at the bottom of the browser's navigation / address URL-bar droplist. However, the icon is missing from the one-off search bar on Firefox's home page (about:home).
See screenshot below:
This does not happen in custom search engines where the icon is linked using a url. In those instances the icons display correctly in all places. Icons also display correctly when adding non-custom search engines using the conventional built-in method. I'm therefore assuming that the missing icon is an Add custom search engine issue, rather than a Firefox issue. It may possibly be due to the fact that the icon being used is a vector image (SVG) instead of raster image (PNG).
I have repeated this problem by creating new search engines with different SVG icons using base64, and each time the icon is not displayed on the Firefox home page one-off search (while displaying correctly everywhere else).
Here is a link to an example of the icon data of a missing icon (in case it's of use): https://pastebin.com/EhiQQXRK