After https://bugzilla.mozilla.org/show_bug.cgi?id=1220564 pin tab not correct visible.
I fix this by editing tabutils.js:2399
before
var urls = [label.url for (label of labelArray)];
after
var urls = [for (label of labelArray) label.url];
May be some need fix errors in other places of code
After https://bugzilla.mozilla.org/show_bug.cgi?id=1220564 pin tab not correct visible. I fix this by editing tabutils.js:2399 before
var urls = [label.url for (label of labelArray)];
aftervar urls = [for (label of labelArray) label.url];
May be some need fix errors in other places of code