[Breakpoints] don't trigger on page restart

[yurydelendik]

STR:

1. Open example and start debugging
2. Set breakpoints at fetch-brk.html line 6
3. Refresh the page
4. Press 'resume' when needed

Expected result:
Debugger stops at breakpoints

Actual result:
Only stops at debugger statements

[jasonLaster]

it looks like promises would work by themselves work. https://dbg-then-bp.glitch.me/

this makes me think that there is something do with a race condition w/ fetch.

[darkwing]

Can confirm this is still an issue. I get why it may be a timing issue but the console statement's breakpoint should get hit at some point

[darkwing]

Still an issue.

[janodvarko]

I can still reproduce this issue.
Reported in Bugzilla
https://bugzilla.mozilla.org/show_bug.cgi?id=1603444

Closing
Honza