[Bug-gnuzilla] icecat connection weirdness

[Reepca Russelstein]

If I try to load a page in icecat (52.6.0) while I am not connected to
a network (as happens when it takes awhile for the connection to get
set up automatically after I open my laptop up), it will fail. After
the connection is set up, though, attempting to load pages will still
fail, even as command-line tools for accessing the pages succeed. If I
do not load a page while not connected, I can still load pages when I
am connected.

I'm running GuixSD relatively-recent-version, kernel 4.15.3-gnu (linux-libre).

As my laptop tends to change connections relatively frequently, and
there's always a 30-second delay or so (which I should separately see
about shortening) before connecting after opening it up, this occurs
fairly often, and it's pretty annoying to have to close everything
because I didn't wait long enough.

To reproduce:
- start icecat
- disconnect from all networks
- try accessing some page (should fail)
- reconnect to network
- try accessing any page (will also fail)