I’m using ecloud NC server with its 7 public apps. I use 4 apps actively and I pin them in tabs and tab row of the browser (Firefox Quantum). It would be helpful, if the tabs’ favicons show the app icons instead of the general ecloud favicon. Is it any settings on the side of the NextCloud? Is this feature implemented yet?
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You can copy icons from /mnt/repo-base/volumes/nextcloud/custom_apps/calendar/img/ to eelo theme, like this (took calendar as example) :
root@vcs1:~# ll /mnt/repo-base/volumes/nextcloud/html/themes/eelo/apps/calendar/img/
total 64
drwxr-xr-x 2 www-data www-data 4096 Jul 13 10:35 ./
drwxr-xr-x 3 www-data www-data 4096 Jul 26 12:42 ../
-rw-r--r-- 1 www-data www-data 279 Jul 13 10:35 calendar.png
-rw-r--r-- 1 www-data www-data 819 Jul 13 10:35 calendar.svg
-rw-r--r-- 1 www-data www-data 2067 Jul 13 10:35 color_picker.svg
-rw-r--r-- 1 www-data www-data 255 Jul 13 10:35 embed.svg
-rw-r--r-- 1 www-data www-data 4286 Jul 13 10:35 favicon.ico
-rw-r--r-- 1 www-data www-data 1503 Jul 13 10:35 favicon-mask.svg
-rw-r--r-- 1 www-data www-data 760 Jul 13 10:35 favicon.png
-rw-r--r-- 1 www-data www-data 1131 Jul 13 10:35 favicon.svg
-rw-r--r-- 1 www-data www-data 3499 Jul 13 10:35 favicon-touch.png
-rw-r--r-- 1 www-data www-data 1136 Jul 13 10:35 favicon-touch.svg
-rw-r--r-- 1 www-data www-data 1849 Jul 13 10:35 loading.gif
-rw-r--r-- 1 www-data www-data 895 Jul 13 10:35 random.svg
-rw-r--r-- 1 www-data www-data 1724 Jul 13 10:35 timezone.svg
I’m not sure that all files are useful 
If favicon don’t show, please clear browser cache and run “maintenance:theme:update” within OCC.
Note : I tried to use a symbolic link instead of files copy, didn’t get it to work 
I guess that I have to be an admin to the server, shan’t I? I’m an ordinary /e/ user on ecloud.global.
Sorry @yopixi, I wrongly thought you are running your own server
For ecloud.global, you can open a support case to have the /e/ theme updated : https://gitlab.e.foundation/e/backlog/-/issues
I proposed an enhancement: