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Initiator document gets all requests (ajax works) blocked after a process

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There's a page where some things are processed with ajax. After the requests I can't go to any link or change the url, all get blocked status (ajax requests all work, also resending it works). What could be causing it? Changed the network.http.max-persistent-connections-per-server to 1000 I'm using version 80.0.1 (64-bit).

Thanks.

There's a page where some things are processed with ajax. After the requests I can't go to any link or change the url, all get blocked status (ajax requests all work, also resending it works). What could be causing it? Changed the network.http.max-persistent-connections-per-server to 1000 I'm using version 80.0.1 (64-bit). Thanks.

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The problem was with the ajax callee. In the backend it used a loop with a curl call, so waiting for the response it froze. Other browsers allowed to change the page afterwards but FF still kept giving blocked status.

Edit: problem still persists.

Modified by gertlaanemets