Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
[x] Corrected handling of links like `private:///#http://example.com/` from Private Tab extension.
[+] Added displaying of resume download ability (in status field) (#4).
[+] Added Ctrl+Shift+C hotkey to open context menu for current row (#5).
[+] All keyboard shortcuts now configurable (extensions.linkPropertiesPlus.key.* preferences) (#6).
[*] Experimental: block Escape key directly after request finished to not accidentally close dialog instead of canceling request (extensions.linkPropertiesPlus.blockEscapeKeyDelay preference).
[*] Improved HTTP headers field: now used formatting and sections are collapsable (#8, #9).
[*] Changed extension icon (#10).
[+] Added toolbar button (#11).
[*] Improved URLs detection is selection: now detects `about:`, but ignores `http:`, `http://` and `file:///`.
[+] Added support for separate message window in Thunderbird and SeaMonkey's mail (#12).
[x] Correctly focus already opened link properties window with the same URI and referer, if URI is empty.
[+] Added ability to not use selection clipboard on Linux to prefill link in properties window (extensions.linkPropertiesPlus.preferSelectionClipboard preference).
[+] Added basic indication of request errors (only in link properties window): invalid URI or request error – red “Get properties” button, protocol with URI_DOES_NOT_RETURN_DATA flag or unknown protocol – gray “Get properties” button.
[*] Show request headers modifications from browser or other extensions (hidden preference extensions.linkPropertiesPlus.showRequestHeadersDiff to highlight changed headers) (#13).
[*] Middle-click on any menu item (and on toolbar button) to automatically start request with URL from clipboard.
[*] Double-click on “Referer:” label (or on empty referer field) to get fake referer from link.
[*] Open links after source tab only if extensions.linkPropertiesPlus.openInChildTab = true, also added extensions.linkPropertiesPlus.openInChildTab.onlyIfSelected preference to open in sibling tab only if source tab is still selected.
[x] Corrected localization for numbers and dates (extensions.linkPropertiesPlus.localeNumbers and extensions.linkPropertiesPlus.localeDates preferences) (#15).
[+] Added ability to save maximized state of properties window.
[+] Properties window: added hotkey to toggle full screen mode (F11).
[*] Implemented ability to drag link into button, that placed inside Australis menu-button (#16).
[x] Correctly handle about:* URIs in Firefox 36+.
[*] Improved support of Electrolysis (multi-process mode).
[*] Improved detection of selected text links (preferences: extensions.linkPropertiesPlus.context.onSelection.ignoreSpaces, extensions.linkPropertiesPlus.context.onSelection.detectionThreshold).
[+] Added ability to send GET request instead of HEAD (#14).
[*] Double-click on “Link:” label (or on empty link field) to paste URI from clipboard.
[x] Fixed compatibility with future Firefox versions (bug 1090880, #18).
[x] Correctly decode URIs in Firefox 40+.
[x] Save links with correct file name in Firefox 40+ (like “Save Link As…” from page context menu).
[*] Now used platform-specific line breaks to copy multiline text to clipboard.
[+] Added ability to detect selected links in input fields (extensions.linkPropertiesPlus.context.onSelection.inInputFields preference).
[+] Added extensions.linkPropertiesPlus.ownWindow.cropFileNameInTitle preference to crop too long file names in window title (or hide it at all).
[+] Now fully compatible with per-window private browsing (include support for Private Tab extension) (#1).
[+] Added tooltip with all redirects to "Direct Link" input field (#2).
[x] Fixed position of item in Tools menu in latest Firefox Nightly.
[*] Minor optimizations and improvements.
[*] Improved handling of HTTP referers:
* "Internal" and file:// links now never used as referers (but you still can manually set any referer).
* Improved handling of built-in network.http.sendRefererHeader preference: now "Referer:" field shows real value (instead of old "internal" handling).
+ Added extensions.linkPropertiesPlus.useFakeReferer.force preference to use fake referer, if rererefs sending was disabled using network.http.sendRefererHeader.
+ Added extensions.linkPropertiesPlus.useRealRefererForTextLinks preference to send real referers for text links.
[*] Improved startup performance for main application window.
[*] Used built-in function to read text from clipboard + added changes for "Implement per-window Private Browsing" bug.
[+] Added possibility to load bypass cache: Shift+Enter or Shift+click/middle-click on "Get properties" button.
[*] Small internal improvements.
[x] In some cases "Apply" button in options dialog was remained incorrectly disabled or enabled.
forum.mozilla-russia.org/viewtopic.php?pid=594991 (sorry, only in Russian, translation)