Import data from local file not working on Firefox

[AliceAAlves]

Describe the bug
Using the Firefox extension, in "Insert Data" block, I was trying to import from a local json file, but preview always shows null.
I tried insert into into a variable anyway, in case the bug was just with the preview data, but the variable is still null.
Using a remote like https://filesamples.com/samples/code/json/sample1.json works. Seems like the issue is with with local files only.

To Reproduce
In "Insert Data" block:

• Click import file button
• Input file path. Ex. C:\Users\Alice\Downloads\test.json
• Click Preview data

File contents:
{ "test": 1, "test2": 2 }

Expected behavior
Expected the preview data to show the file contents, which are valid json.
Instead I get null

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Firefox 125.0.3
• Extension Version: 1.28.27

Is this a known issue or am I doing something wrong?