Uncaught (in promise) Error: detectIncognito cannot determine the browser

[2Owy]

on last version of Firefox 143.

[Joe12387]

Unable to reproduce on Firefox 143, macOS.

If anyone is affected, run this code in console and give me the output, please:

var toFixedEngineID = 0; var neg = parseInt("-1"); try { neg.toFixed(neg) } catch (e) { toFixedEngineID = e.message.length }console.log('toFixedEngineID', toFixedEngineID);

[2Owy]

The output to
var toFixedEngineID = 0; var neg = parseInt("-1"); try { neg.toFixed(neg) } catch (e) { toFixedEngineID = e.message.length }console.log('toFixedEngineID', toFixedEngineID);
is:
toFixedEngineID 0

[2Owy]

I'm on Windows 10.

[Joe12387]

1. Disable all plugins and make sure Number.prototype.toFixed exists.
2. If it exists, try (-1).toFixed(-1) and see if/what error is produced.
3. If an error is produced, catch it in a try/catch and check the value of e.message.length where e is your caught error.

[2Owy]

In my case the Number.prototype.toFixed is overwritten by Decimal.js toFixed.
2. It returns "-1".

[hecksadecimal]

Unable to reproduce on Firefox 143, macOS.

If anyone is affected, run this code in console and give me the output, please:

var toFixedEngineID = 0; var neg = parseInt("-1"); try { neg.toFixed(neg) } catch (e) { toFixedEngineID = e.message.length }console.log('toFixedEngineID', toFixedEngineID);

On Android, Firefox 143

toFixedEngineID 25

Still getting 'cannot determine the browser'.

(-1).toFixed(-1) results in RangeError: precision -1 out of range

[amontandon]

On Linux, Firefox 143.0.1

toFixedEngineID 25

Still getting 'cannot determine the browser'.

(-1).toFixed(-1) results in Uncaught RangeError: precision -1 out of range

[Joe12387]

Making sure everyone's on the same page:

1. Make sure you're on detectincognito.com.
2. If incognito detection doesn't work there, there's an issue with this library. If it does work there, there's a problem with your project's dependencies (see @2Owy's post). Check if Number.prototype.toFixed is overwritten using Number.prototype.toFixed.toString() in your project, it should be a native function. If it is modified, figure out what dependency it is such as Decimal.js. Either avoid the dependency or create an issue w/ the dependency to correct the expected behavior.

[mohit-hs]

@Joe12387 @2Owy On Windows, Firefox 143.0. getting 'cannot determine the browser'

1. Disable all plugins and make sure Number.prototype.toFixed exists.
2. If it exists, try (-1).toFixed(-1) and see if/what error is produced.
3. If an error is produced, catch it in a try/catch and check the value of e.message.length where e is your caught error.

1. No plugins installed and Number.prototype.toFixed exists
2. (-1).toFixed(-1) gives error
3. e.message.length is 25
4. https://detectincognito.com/ is able to detect the incognito window

[Joe12387]

@Joe12387 @2Owy On Windows, Firefox 143.0. getting 'cannot determine the browser'

1. Disable all plugins and make sure Number.prototype.toFixed exists.
2. If it exists, try (-1).toFixed(-1) and see if/what error is produced.
3. If an error is produced, catch it in a try/catch and check the value of e.message.length where e is your caught error.

1. No plugins installed and  Number.prototype.toFixed exists

2. (-1).toFixed(-1) gives error

3. e.message.length is 25

4. https://detectincognito.com/ is able to detect the incognito window

Your project's Number.prototype.toFixed is likely patched. Run Number.prototype.toFixed.toString() in your project.

[mohit-hs]

@Joe12387 @2Owy On Windows, Firefox 143.0. getting 'cannot determine the browser'

1. Disable all plugins and make sure Number.prototype.toFixed exists.
2. If it exists, try (-1).toFixed(-1) and see if/what error is produced.
3. If an error is produced, catch it in a try/catch and check the value of e.message.length where e is your caught error.

1. No plugins installed and  Number.prototype.toFixed exists

2. (-1).toFixed(-1) gives error

3. e.message.length is 25

4. https://detectincognito.com/ is able to detect the incognito window

Your project's Number.prototype.toFixed is likely patched. Run Number.prototype.toFixed.toString() in your project.

@Joe12387 After running Number.prototype.toFixed.toString() I got
"function toFixed() { [native code] }"
cc: @milan-magyar

[mohit-hs]

@Joe12387 Are we planning any fix for it?

[rxob]

On Linux, Firefox 143.0.1

toFixedEngineID 25

Still getting 'cannot determine the browser'.

(-1).toFixed(-1) results in Uncaught RangeError: precision -1 out of range

Weird .. works for me on 143 & 144 (143.0, 143.0.1, 143.0.3, 143.0.4, 144.0)