Small images from private tabs (displayed with favicons) are cached to disk

[Infocatcher]

Reported here: https://addons.mozilla.org/addon/private-tab/reviews/462226/
(more than one reason?)

See gBrowser.setIcon():
view-source:chrome://browser/content/tabbrowser.xml

      <method name="setIcon">

              ...
              this.mFaviconService.setAndFetchFaviconForPage(browser.currentURI,
                                                             aURI, false,
                                                             PrivateBrowsingUtils.isWindowPrivate(window) ?
                                                               this.mFaviconService.FAVICON_LOAD_PRIVATE :
                                                               this.mFaviconService.FAVICON_LOAD_NON_PRIVATE);

[Infocatcher]

And (both from setIcon()):

aTab.setAttribute("image", sizedIconUrl);

and

this._callProgressListeners(browser, "onLinkIconAvailable", [browser.mIconURL]);

=>
resource://app/modules/WindowsPreviewPerTab.jsm
TabWindow.prototype.onLinkIconAvailable()

[galedrag]

Not only the favicons. For example I searched google the word "sunrise" and I can retrieve the next image

[Infocatcher]

and I can retrieve the next image

Oh, forgot about this because I use browser.pagethumbnails.capturing_disabled = true
=> #58

[galedrag]

I did not know that option, thanks

[Infocatcher]

Looks fixed for me.
But only in Firefox, see #62.

[galedrag]

Works for me, thanks