Funkcionalnosć toś togo sedła se pśez wótwardowańske źěła wobgranicujo, kótarež maju wašo dožywjenje pólěpšyś. Jolic nastawk waš problem njerozwězujo a cośo pšašanje stajiś, wobrośćo se na našo zgromoźeństwo pomocy, kótarež na to caka, wam na @FirefoxSupport na Twitter a /r/firefox na Reddit pomagaś.

Pomoc pśepytaś

Glědajśo se wobšudy pomocy. Njenapominajomy was nigda, telefonowy numer zawołaś, SMS pósłaś abo wósobinske informacije pśeraźiś. Pšosym dajśo suspektnu aktiwitu z pomocu nastajenja „Znjewužywanje k wěsći daś“ k wěsći.

Dalšne informacije

I need to delete the gobbledegook which appears between the message and the header.

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Codes and letters and numbers appear in my header - Received by.....Arc message ARC Seal etc. I need to stop this and have a clear space and only necessary information in the header.

Codes and letters and numbers appear in my header - Received by.....Arc message ARC Seal etc. I need to stop this and have a clear space and only necessary information in the header.

Wšykne wótegrona (1)

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I think those must be the "full" message headers. The following is from a Sept. 2015 post. Could you check whether it's still applicable:

On Windows, tap the Alt key to display the menu bar if needed:

View > Headers

It sounds as though you have "Full" selected instead of "Normal". If you switch it to Normal, do messages look the way you want?