Browser Extension Store Sizes — Compared
Every image and text requirement for Chrome, Firefox, and Edge add-on stores — side by side in one reference.
Last updated April 2026
Icon Sizes
| Asset | Chrome | Firefox | Edge |
|---|---|---|---|
| Store / Listing Icon | 128×128 | 128×128 | 128×128 |
| Management Icon | 48×48 | 48×48 | 48×48 |
| Toolbar Icon | 16×16 | 16×16 to 32×32 | 16×16 to 32×32 |
| Windows Icon | 32×32 | 32×32 | 32×32 |
| Icon Format | PNG only | PNG or SVG | PNG only |
Screenshot Sizes
| Asset | Chrome | Firefox | Edge |
|---|---|---|---|
| Screenshot Size | 1280×800 or 640×400 | Any (max 3MB) | 1280×800 or 640×400 |
| Max Screenshots | 5 per language | 5 | 10 |
| Format | PNG or JPEG | PNG or JPEG | PNG or JPEG |
Promotional Images
| Asset | Chrome | Firefox | Edge |
|---|---|---|---|
| Small Promo | 440×280 | — | 440×280 |
| Large Promo | 920×680 | — | 920×680 |
| Marquee / Hero | 1400×560 | — | 1400×560 |
Text Limits
| Asset | Chrome | Firefox | Edge |
|---|---|---|---|
| Name | 75 chars | 50 chars | 75 chars |
| Short Description | 132 chars | 250 chars (summary) | 132 chars |
| Full Description | 16,384 chars | Unlimited (HTML) | 16,384 chars |
Key Differences
Firefox supports SVG icons
Chrome and Edge require PNG only. Firefox accepts both PNG and SVG, which is better for scalability.
Firefox has no promo images
Chrome and Edge have identical promotional image requirements. Firefox doesn't have an equivalent feature.
Edge allows more screenshots
Edge allows up to 10 screenshots vs Chrome's 5. Use the extra slots to show more features.
Firefox uses HTML descriptions
Firefox supports full HTML in descriptions. Chrome and Edge use plain text with a character limit.
Chrome and Edge share most requirements
Edge Add-ons is based on Chromium, so image requirements are nearly identical to Chrome Web Store.
CWS Kit generates assets for Chrome Web Store and works for Edge Add-ons too (same dimensions).
Open CWS Kit — It's Free