One possible reason for this discrepancy could be the presence of an embedded color profile in the JPEG image causing different interpretations by various browsers. To ensure consistency in color representation across different browsers, it is recommended to export images using the sRGB color space.
For example, if you are using Photoshop, utilizing the "Save for Web & Devices" feature will automatically convert the image to the sRGB color space. The process of changing the export color space may vary depending on the image editing software you are using.
To learn more about how color profiles can impact color display on the web, please refer to this informative article on CSS-Tricks.