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Alive Capture · Images

Cache Me If You Can

Capture images received by a Firefox tab on demand, even when the website later removes them from the page.

Surface

Firefox desktop · Extension

Status

Alive

Release

Version 1.1.5

Catching ephemeral web images

Cache Me If You Can observes only the selected tab and domain during an explicitly started session. Image bytes received by Firefox are copied, then forwarded unchanged without a second request. A local gallery then lets users inspect, sort, select, download and export their captures.

Availability

Firefox Add-ons review in progress

Version 1.1.5 is awaiting Mozilla approval. Its Firefox Add-ons listing will be available at the address below once approved. The source code and MPL-2.0 license are already public.

Firefox Add-ons → Source code → MPL-2.0 license →

At a glance

Version

1.1.5

Firefox

142+ desktop

Deduplication

SHA-256

Storage

10 GiB · 4 GiB private

Data transmitted

None

License

MPL-2.0

What's in it

F—01 Opt-in capture of HTTP(S) images received by the active tab
F—02 Normal images, srcset, fetch/XHR and signature-recognized binaries
F—03 SHA-256 deduplication while preserving URLs and occurrences
F—04 Renameable sessions and a gallery with sorting, enlargement and pagination
F—05 Individual downloads or ZIP exports split below 512 MiB
F—06 Session resume on an equivalent page of the same domain

Capture session

Copy the stream without requesting it again.

The extension does not inspect Firefox’s historical cache. It keeps only responses that pass through the tab after an explicit start, including responses Firefox serves from browser cache during that session.

S—01

Arm a tab

Capture begins only after a popup click and follows the chosen registrable domain.

S—02

Copy without alteration

Every observed image byte is sent to storage, then immediately forwarded to Firefox unchanged.

S—03

Deduplicate without losing context

Identical content is stored once while its URLs and discovery dates remain as occurrences.

S—04

Browse and export

The gallery can filter, select and save images or local ZIP archives.

Screens

Cache Me If You Can local gallery with a capture session and preserved images — UI—01 **Local gallery, sorting and export of captured images**

Enlarged preview of a captured image in Cache Me If You Can — UI—02 **Full-size preview and individual download**

Dialog used to rename a capture session — UI—03 **Rename a session to keep the gallery organized**

Privacy

No server, no account, no synchronization.

In normal browsing, captures stay in IndexedDB inside the Firefox profile. In private browsing, they live only in memory and disappear when the last private window closes.

P—01 No telemetry or data collection or transmission
P—02 No access to local files or download history
P—03 Data leaves Firefox only through a user-requested export

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