don’t know what i did.
In the whisker menu the whole category “internet” disappeared.
Also some icons/apps from “all applications” disappeared.
Which are: firefox, chromium, thunderbird, filezilla. (maybe more).
There’s only this “start firefox” icon (2 little gearwheels),
when i type the whole app name.
Also browsing the internet became veeery slow,
with both ff and chromium.
Also Thunderbird is slow in connecting the mail servers.
On another tablet computer internet is fast as usual.