Construct 3 won't load projects on Firefox

It worked just fine until yesterday. Been using Construct 3 for several months now, currently working on a game project. I've been working on Firefox during all this time.

Today I tried to open the project and the screen went red with an error message. Here's a copy-paste of the error:

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Error report information

Type: unhandled exception

File: editor.construct.net/r458-2/main.js, line 29, col 852424

Message: TypeError: GPUCommandEncoder.beginRenderPass: Element of sequence branch of (sequence or GPUColorDict) is not a finite floating-point value.

Stack: eGn@https://editor.construct.net/r458-2/main.js:29:852424 l_n@https://editor.construct.net/r458-2/main.js:29:850951 Ts@https://editor.construct.net/r458-2/main.js:29:862029 f_n@https://editor.construct.net/r458-2/main.js:29:866546 JVs@https://editor.construct.net/r458-2/main.js:29:866426 qi@https://editor.construct.net/r458-2/projectResources.js:1:468238 iR@https://editor.construct.net/r458-2/components/editors/layoutView/layoutView.js:1:8071 window.lG Construct version: r458.2

URL: editor.construct.net

Date: Tue Nov 11 2025 21:55:56 GMT-0300 (hora estándar de Argentina)

Uptime: 381.5 s

Platform information

Product: Construct 3 r458.2 (stable)

Browser: Firefox 145.0

Browser engine: Gecko

Context: browser

Operating system: Windows 10

Device type: desktop

Device pixel ratio: 1

Logical CPU cores: 8

Approx. device memory: (unavailable)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

Language setting: en-US

WebGPU information

Renderer: WebGPU

Supports GPU profiling: yes

Major performance caveat: no

Maximum texture size: 16384

Adapter vendor: (unavailable)

Adapter architecture: (unavailable)

Adapter device: (unavailable)

Adapter description: (unavailable)

Adapter type: (unavailable)

Adapter backend: (unavailable)

Adapter features: bgra8unorm-storage, core-features-and-limits, depth-clip-control, depth32float-stencil8, float32-filterable, indirect-first-instance, rg11b10ufloat-renderable, texture-compression-bc, texture-compression-bc-sliced-3d, timestamp-query

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I tried using Construct 3 on Chrome and it loads projects normally, so worst-case scenario I can work there; but it really sucks that it seems to be not willing to cooperate on Firefox now.

Side note: if I try starting a new project on Firefox it seems to be able to. I don't think it can LOAD it, though.

Any idea what this could possibly be?

Opening projects in Firefox is working fine for me with the latest release. Generally it's impossible to fix problems like this unless you file an issue following all the guidelines, as we need all the requested information to be able to investigate.

WebGPU is now enabled by default in the editor and it looks like possibly an issue with the WebGPU implementation in Firefox. In the mean time you could try disabling WebGPU in Settings as a workaround.

Opening projects in Firefox is working fine for me with the latest release. Generally it's impossible to fix problems like this unless you file an issue following all the guidelines, as we need all the requested information to be able to investigate.

WebGPU is now enabled by default in the editor and it looks like possibly an issue with the WebGPU implementation in Firefox. In the mean time you could try disabling WebGPU in Settings as a workaround.

Thanks for the reply.

I've tried disabling WebGPU from the Settings, then restarted Construct 3, but the issue prevails. :-/

I'll be using Construct 3 on Chrome for now, since I'm in a deadline and I don't really have time to try to solve this on Firefox. I'll file the issue at a later time.

Someone else mentioned an error using Firefox 145 and it looks like there's a regression in Firefox itself that's breaking Construct at the moment. It looks like it works in Firefox Nightly, so it appears to be something Mozilla already identified and fixed. I filed an issue with them anyway in the hopes they can patch the latest stable release of Firefox sooner than just waiting for the stable release to update which could take a couple of months.

Someone else mentioned an error using Firefox 145 and it looks like there's a regression in Firefox itself that's breaking Construct at the moment. It looks like it works in Firefox Nightly, so it appears to be something Mozilla already identified and fixed. I filed an issue with them anyway in the hopes they can patch the latest stable release of Firefox sooner than just waiting for the stable release to update which could take a couple of months.

Thank you so much; that's much appreciated!

Updating to Firefox Beta 146 worked!