Unable to run cypress on firefox browser while same scripts are running on different browsers

[vishal-sharma-veersa]

We were running cypress on edge, chrome and electron but now we have to run our tests on firefox but while doing so getting some BiDi errors
logs here

`
GET /loader_wheels/wheel_w_message.svg?message=Loading... 200 863.559 ms - -
cypress:proxy:http:util:prerequests Never received pre-request or url without pre-request for request GET-https://refactor-automation.kipuqa.com/packs/emr-v3/7347.33d969e0.js after waiting 500ms. Continuing without one. +0ms
GET /www/delivery/asyncjs.php 404 1507.211 ms - -
GET /api/settings/company_settings/org_logo 200 1226.594 ms - -
GET /s/roboto/v49/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBGEe.woff2 200 75.347 ms - -
GET /api/emr/generative_ai/prompts?type=GROUP%20NOTE%20ASSISTANT - - ms - -
GET /packs/emr-v3/7347.33d969e0.js 200 2528.562 ms - -
POST /users/sign_in 302 1105.539 ms - 76
WebDriver Bidi command "network.continueRequest" failed with error: unknown error - [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIHttpChannel.setRequestHeader]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: chrome://remote/content/shared/NetworkRequest.sys.mjs :: setRequestHeader :: line 267" data: no]
Error: WebDriver Bidi command "network.continueRequest" failed with error: unknown error - [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIHttpChannel.setRequestHeader]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: chrome://remote/content/shared/NetworkRequest.sys.mjs :: setRequestHeader :: line 267" data: no]
at BidiHandler.send (file:///C:/Users/VishalSharma/AppData/Local/Cypress/Cache/15.3.0/Cypress/resources/app/packages/server/node_modules/webdriver/build/node.js:472:23)
at BidiHandler.networkContinueRequest (file:///C:/Users/VishalSharma/AppData/Local/Cypress/Cache/15.3.0/Cypress/resources/app/packages/server/node_modules/webdriver/build/node.js:874:31)
at Browser.value (file:///C:/Users/VishalSharma/AppData/Local/Cypress/Cache/15.3.0/Cypress/resources/app/packages/server/node_modules/webdriver/build/node.js:1377:26)
at EventEmitter.onBeforeRequestSent (:2515:153141)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

Driver Stack:
at setRequestHeader@chrome://remote/content/shared/NetworkRequest.sys.mjs:267:19
at continueRequest@chrome://remote/content/webdriver-bidi/modules/root/network.sys.mjs:820:19
at handleCommand@chrome://remote/content/shared/messagehandler/MessageHandler.sys.mjs:260:33
at execute@chrome://remote/content/shared/webdriver/Session.sys.mjs:410:32
at onPacket@chrome://remote/content/webdriver-bidi/WebDriverBiDiConnection.sys.mjs:236:37
at onMessage@chrome://remote/content/server/WebSocketTransport.sys.mjs:127:18
at handleEvent@chrome://remote/content/server/WebSocketTransport.sys.mjs:109:14
cypress:proxy:http:util:prerequests Never received pre-request or url without pre-request for request GET-https://assets.kipuqa.com/packs/emr-v3/5895.cd8f0c94.js after waiting 500ms. Continuing without one. +3s
GET /packs/emr-v3/5895.cd8f0c94.js 200 558.643 ms - -
cypress:proxy:http:util:prerequests metrics: { browserPreRequestsReceived: 93, proxyRequestsReceived: 43, immediatelyMatchedRequests: 41, unmatchedRequests: 2, unmatchedPreRequests: 0 } +2s
`

tried upgrading/downgrading cypress to latest or down to 13.15.2
able to run the same scripts in different browsers

[MikeMcC399]

@vishal-sharma-veersa

This is possibly due to https://bugzilla.mozilla.org/show_bug.cgi?id=1791813

[vishal-sharma-veersa]

so is there any workaround to run cypress on firefox or we have to just accept that we can't 🙄

[MikeMcC399]

@vishal-sharma-veersa

Cypress officially supports the latest 3 major versions of Chrome, Firefox, and Edge.

For Firefox this is 143, 142 & 141

Firefox does run in several different Cypress example workflows, for example https://github.com/cypress-io/github-action/actions/runs/17977995873/job/51136204041 using Firefox 142.0.1 with Cypress 15.3.0.

The bug link I posted was about a special case of cookie creation. If you can share an example repository where you are having an issue running with Firefox, it may be possible to say more.

[vishal-sharma-veersa]

i was using firefox 143 cypress 14.5.4
and just after login cypress closes on its own
this was our command to login
cy.url().then($currenturl => { if ($currenturl.includes("/sign_in")) { var decryptPass = encryptor.decrypt(password) cy.log("Typing Username") loginPage.getUserName().type(username, {log: false}) cy.log("Typing Password") loginPage.getPassword().type(decryptPass, {log: false}) commonPage.getSubmitOrSearchButton().click() } else { cy.logout() Login.withCredentials(username, password) }
the main issue is I think with the login flow of our website where in login there are 3 xhrs first for sign_in(302 POST) then CAS(302 GET) and then it moves to the homepage of the website (200 get)
can we use anything to bypass this internal cookie issue
and we can't login using cy.requests so that we could have bypassed everything here

[MikeMcC399]

@vishal-sharma-veersa

Sorry, I can't help you with the code for your login issue. If nobody else replies here, you may try asking in the Cypress community chat on Discord.

[vishal-sharma-veersa]

i was trying to say it should work for every flow and we should not be getting this cookie error as we used chrome / edge / electron and they were working fine
we also tried latest cypress version with latest firefox still got the errors
but they were working fine on chrom edge electron