Find and save JSON file from server response to a browser action - json

Question

During activities in the browser (Mozilla Firefox) game-server sending response with the JSON in the body. Example:
What I'm looking for is a way to save/rewrite this JSON file body from this server into txt file on my pc automatically (each time server sending me a JSON file I want it to be saved in the folder on my pc eg. C:/DevProj/data.txt).
I definitely can save it manually using dev mode(f12), but I'm looking for something to automate this process.
How can I automate the save process?
Raw response JSON Headers example:
HTTP/1.1 200 OK
Date: Wed, 23 Nov 2022 13:55:59 GMT
Content-Type: text/json; charset=windows-1251
Content-Length: 7510
Connection: keep-alive
Pragma: no-cache
Expires: 0
Cache-Control: no-cache
HTTPVersion: 1.1
cache-control: no-cache
pragma: no-cache
server: Apache
Reason: OK
expires: 0
battleidproxy: 1669211553.97558
Access-Control-Allow-Origin: http://*.combats.com
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Authorization,DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Content-Version
Access-Control-Expose-Headers: Content-Length,Content-Range
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://*.combats.com
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Authorization,DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Content-Version
Access-Control-Expose-Headers: Content-Length,Content-Range
Access-Control-Allow-Credentials: true
Raw Response JSON body example:
{"timeout":0,"manahealleft":0,"damage":[{"sDamage":"00000","nDamage":"1164"},{"sDamage":"00000","bEnemy":1}],"healleft_euro":2535,"methods":[{"sMagicType":null,"bEnable":0,"sTarget":"self","sID":"hp_defence","bFreeCast":1,"bSelectTarget":0,"arrResources":"0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0","sSrc":"hp_defence","sDesc":"someText.","sText":"someText","sTargetLogin":null,"bAuto":0},{"sText":"someText","sDesc":"someText","arrResources":"0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0","bSelectTarget":0,"sSrc":"hp_enrage","bAuto":0,"sTargetLogin":null,"sMagicType":null,"sTarget":"self","bEnable":0,"bFreeCast":1,"sID":"hp_enrage"},{"bEnable":0,"sTarget":"self","sMagicType":null,"sID":"hit_luck","bFreeCast":1,"bSelectTarget":0,"arrResources":"5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0","sSrc":"hit_luck","sText":"someText","sDesc":"someText","sTargetLogin":null,"bAuto":0},{"sTargetLogin":null,"bAuto":0,"sText":"someText","sDesc":"someText","bSelectTarget":0,"sSrc":"block_aftershock","arrResources":"0,0,0,3,0,0,0,0,0,0,4,0,0,0,3,0","bFreeCast":1,"sID":"block_aftershock","sMagicType":null,"sTarget":"current_enemy","bEnable":0},{"sID":"block_activeshield","bFreeCast":1,"bEnable":0,"sTarget":"self","sMagicType":null,"bAuto":0,"sTargetLogin":null,"bSelectTarget":0,"arrResources":"0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0","sSrc":"block_activeshield","sDesc":"someText","sText":"someText"},{"sTargetLogin":null,"bAuto":0,"sDesc":"someText","sText":"someText","bSelectTarget":0,"sSrc":"novice_def","arrResources":"0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0","bFreeCast":1,"sID":"novice_def","sTarget":"self","bEnable":1,"sMagicType":null},{"sMagicType":null,"bEnable":0,"sTarget":"self","sID":"block_kupol","bFreeCast":1,"bSelectTarget":0,"arrResources":"1,0,0,2,0,0,0,0,0,0,7,0,0,0,0,0","sSrc":"block_kupol","sDesc":"someText","sTargetLogin":null,"bAuto":0},{"sTarget":"self","bEnable":0,"sMagicType":null,"bFreeCast":1,"sID":"hp_regen","sDesc":"someText","sText":"someText","arrResources":"0,0,0,0,0,5,0,0,0,0,3,0,0,0,0,0","bSelectTarget":0,"sSrc":"hp_regen","bAuto":0,"sTargetLogin":null},{"sMagicType":null,"sTarget":"self","bEnable":0,"bFreeCast":1,"sID":"block_fullshield","sDesc":"someText","sSrc":"block_fullshield","bSelectTarget":0,"arrResources":"0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0","sTargetLogin":null,"bAuto":0},{"sID":"hit_willpower","bFreeCast":1,"bEnable":1,"sTarget":"self","sMagicType":null,"bAuto":0,"sTargetLogin":null,"bSelectTarget":0,"arrResources":"3,0,0,0,0,0,0,0,0,0,6,0,0,0,0,0","sSrc":"hit_willpower","sText":"someText","sDesc":"someText"},{"sTarget":null,"bEnable":0,"sMagicType":null,"bFreeCast":0,"sID":"break","sDesc":null,"sText":null,"bSelectTarget":0,"sSrc":"break","arrResources":"0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0","bAuto":0,"sTargetLogin":null},{"sTarget":"self","bEnable":0,"sMagicType":null,"bFreeCast":1,"sID":"preparation","sDesc":"someText","bSelectTarget":0,"arrResources":"0,0,0,0,0,0,0,0,0,0,100,53,0,0,0,0","sSrc":"preparation","sTargetLogin":null,"bAuto":0},{"sText":"someText","sDesc":null,"sSrc":"pet_unleash","bSelectTarget":0,"arrResources":"0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0","sTargetLogin":null,"bAuto":0,"sMagicType":null,"sTarget":null,"bEnable":0,"bFreeCast":1,"sID":"pet_unleash"}],"attacks":1,"noblocks_mod":"1","resources":{"parry":"1","block":"1","krit":"0","spirit":"10","counter":"0","spiritmax":"10.00","hit":"3","hp":"4"},"healleft":1690,"defend":1,"is_json":1,"buttons":{"change_enemy":0,"hide_log":0,"gameover":0,"exit":0,"leader_change":0,"commit":1,"refresh":0,"focus_target":0,"leader_kill":0,"refresh2":1},"defend_text":3,"timetoattack":30,"groups":2,"attacks_text":"1","id":"1669211553.97558","canuse":null,"manahealleft_euro":0,"lastlog":214,"message":"","logs":["211|<font class=date>16:55</font> <span class=\"b2\">Бродячий Пламенный Сантехник</span>, победив страх, решил поразить <span class=\"b1\">Ragnir</span> заклятьем "<strong><B><FONT color=#A00000>Огненный щит</FONT></B></strong>". <Font Color=#006699 title=\"<b>Бродячий Пламенный Сантехник</b><BR><BR>Мощь: ??, Защита: 148, Подавление: ??\"><b>-8</b></Font> [42/845]","212|<SCRIPT>adh(5,34,\"16:55\",12)</SCRIPT><span class=\"b2\">Бродячий Пламенный Сантехник</span> пошатнулся, и вдруг, <span class=\"b1\">Ragnir</span> робко рубанул тяжелой дубиной в правую ногу противника. <Font Color=#006699 title=\"Мощь: 0, Защита: ??\"><b>-12</b></Font> [150/500]","213|<SCRIPT>adh(3,234,\"16:55\",21)</SCRIPT><span class=\"b2\">Бродячий Пламенный Сантехник</span> закашлялся и <span class=\"b1\">Ragnir</span> остановил тычок узловатым корнем в левый бок.","214|<font class=sysdate>16:55</font> <span class=\"b1\">Ragnir</span> утратил здоровье от <B>Вони Зомби</B>. <Font Color=green title=\"<b>Теплый Зомби</b>\"><b>-12</b></Font> [30/845]<SCRIPT>dv();</SCRIPT>"],"user":[{"sName":"Ragnir","nLevel":"6","sAlign":0,"slots_cd":{"102":0,"100":0,"101":0,"103":0,"104":0},"nMaxHP":845,"sTitle":"<B>Ragnir</B><BR>Сила: 28<BR>Ловкость: 3<BR>Интуиция: 3<BR>Выносливость: 50<BR>Уровень духа: 10.00","nHP":30,"sClan":"","nCount":1,"sID":"1668473194","role":"256","config_blinker":0,"arrEffects":[{"sSrc":"http://img.combats.com/i/misc/icons/ico_pet_dog.gif","sTitle":"<B>Верный Друг [5]</B> (Эффект)<BR>Осталось: 23 ч. 56 мин. <BR><BR>Уровень жизни (HP): +125<BR><BR>Автор: <B>Рык (зверь Ragnir)</B><BR>","debuff":0,"ot":0,"sType":null,"sID":"ico_pet_dog"},{"sType":null,"sID":"hp_enrage","sTitle":"<B>Ярость</B> (Превозмогание)<BR><BR>Мф. мощности урона (%): +5<BR>Мф. мощности магии стихий (%): +5<BR>","sSrc":"http://img.combats.com/i/misc/icons/hp_enrage.gif","debuff":0,"ot":0},{"sType":null,"sID":"bot_rottenwater","sStack":"x3","debuff":0,"sTitle":"<B><U>Вонь Зомби</U></B> (Эффект) x 3<BR>Зарядов: 99982<BR>Вонь разложения, усиленная жаром, становится невыносимой<BR><BR>Автор: <B>Теплый Зомби</B><BR>","sSrc":"http://img.combats.com/i/misc/icons/bot_rottenwater.gif","ot":0}],"side":1,"group":1,"sVirtID":"A0WMzpCFGYzSw"},{"sName":"Бродячий Пламенный Сантехник","sAlign":0,"nMaxHP":500,"sTitle":"<B>Бродячий Пламенный Сантехник</B><BR>Сила: 0<BR>Ловкость: 10<BR>Интуиция: 15<BR>Выносливость: 30<BR>","nHP":150,"nLevel":"7","enemy":1,"role":0,"sClan":null,"sID":"612716","nCount":1,"side":2,"arrEffects":[],"sVirtID":"A0szjb.TQxYYc"}],"list":[[1,"Ragnir",30,720,0,0,0,0,0,0,0],[2,"Бродячий Пламенный Сантехник",150,"500",0,0,1,0,0,0,1]],"i_dead":null}
I've tried some Firefox extensions such as HeaderSpy and some other tools but can't find anything that would suits my needs.