What size are Mozilla Ads Medium Rectangle ads?

Mozilla Ads Medium Rectangle ads are 300×250 pixels with an aspect ratio of 6:5.

What aspect ratio does Mozilla Ads Medium Rectangle use?

Mozilla Ads Medium Rectangle supports 6:5 aspect ratio.

Which file formats does Mozilla Ads Medium Rectangle accept?

Mozilla Ads Medium Rectangle accepts JPG and PNG files.

Where does Mozilla Ads Medium Rectangle appear on Mozilla Ads?

Mozilla Ads Medium Rectangle ads appear in the New Tab placement on Mozilla Ads.

Where can I find the official Mozilla Ads Medium Rectangle documentation?

The official source for Mozilla Ads Medium Rectangle requirements is https://www.mozilla.org/en-US/advertising/solutions/, linked from this page.

Are these Mozilla Ads Medium Rectangle specs kept up to date?

Yes — every spec entry references Mozilla Ads's official documentation source so dimensions, file size limits, and codec requirements stay in sync as the platform changes.

Can I reuse the same creative for other Mozilla Ads placements?

Often partially — many Mozilla Ads placements share aspect ratios but differ in safe zones, duration, or file size. Always cross-check the target placement's spec page before reusing creative.

Mozilla Ads Medium Rectangle ad specs

Mozilla Ads Medium Rectangle ads are horizontal 6:5 still images, measured at 300×250 px, delivered as JPG or PNG. They run in the New Tab placement on Mozilla Ads. Use these requirements to brief designers, validate uploads, and avoid creative rejections in Mozilla Ads's ad manager.

Dimensions: 300×250 px
Aspect ratio: 6:5
File types: JPG, PNG

Visual specifications

Dimensions	300 × 250 px
Aspect ratios	6:5
Orientation	landscape
File types	JPG, PNG

Notes & source

IAB standard 300×250 medium rectangle on the Firefox New Tab page.

Official source: https://www.mozilla.org/en-US/advertising/solutions/

Frequently asked questions

What size are Mozilla Ads Medium Rectangle ads?: Mozilla Ads Medium Rectangle ads are 300×250 pixels with an aspect ratio of 6:5.
What aspect ratio does Mozilla Ads Medium Rectangle use?: Mozilla Ads Medium Rectangle supports 6:5 aspect ratio.
Which file formats does Mozilla Ads Medium Rectangle accept?: Mozilla Ads Medium Rectangle accepts JPG and PNG files.
Where does Mozilla Ads Medium Rectangle appear on Mozilla Ads?: Mozilla Ads Medium Rectangle ads appear in the New Tab placement on Mozilla Ads.
Where can I find the official Mozilla Ads Medium Rectangle documentation?: The official source for Mozilla Ads Medium Rectangle requirements is https://www.mozilla.org/en-US/advertising/solutions/, linked from this page.
Are these Mozilla Ads Medium Rectangle specs kept up to date?: Yes — every spec entry references Mozilla Ads's official documentation source so dimensions, file size limits, and codec requirements stay in sync as the platform changes.
Can I reuse the same creative for other Mozilla Ads placements?: Often partially — many Mozilla Ads placements share aspect ratios but differ in safe zones, duration, or file size. Always cross-check the target placement's spec page before reusing creative.