Load "preload" stylesheets now (May 28, 2020)

Some sites try to preload style sheets and that doesn't work in Firefox yet. See post no. 1288658#answer-1316602. LoadSS

Convert Selection Links to Bookmark Export File (April 27, 2020)

See Reddit thread https://www.reddit.com/r/firefox/comments/g9788h/how_do_i_bookmark_many_links_from_a_webpage_all/. Links2Bmks

Hide Google Results Page Footer (Nov. 23, 2019)

The footer gets huge and blocks the page on movie searches (presumably it's temporary). Click to hide. See post no. 1273539#answer-1268468. GoogleHideFooter

Print all top level frames (Sept. 10, 2019)

Frames do not always print in order. This may work better with print.always_print_silent set to true. See post no. 1268503#answer-1250982. PrtFrames

Reader View Large Font (choices from 32px to 144px) (Sept. 5, 2019; updated Sept. 21, 2019)

See post no. 1267960#answer-1249618.

Using setProperty() method: Read-60 Read-72 Read-84 Read-96 Read-108 Read-120 Read-132 Read-144

Smaller sizes (not needed with Firefox 69.0.1): Read-32 Read-36 Read-40 Read-44 Read-48 Read-54

Load Current URL in Google Docs Viewer - intended for PDFs (June 26, 2019)

See post no. 1263148#answer-1233147. GDocsView

Kill Ctrl+b, Ctrl+i and Ctrl+u on SAAB Central Forum (March 10, 2019)

See post no. 1252519#answer-1204070. SAAB-biu

Save PDF Viewer pages to JPEG (January 1, 2019)

See Reddit thread How to export pdf as jpg?. PDF 2 JPG

Save PDF Viewer pages to PNG (January 1, 2019)

See Reddit thread How to export pdf as jpg?. PDF 2 PNG

Override @page{margin} rules (December 9, 2018)

See post no. 1243091#answer-1179748. MarginFix

Normalize spaces in List Item nodes (June 26, 2018)

See post no. 1223100#answer-1127023. NormLI

Unblock Pasting on YouTube (June 7, 2018)

See post no. 1220986#answer-1120362. YTPaste

YouTube Sidebar Scrollable (Mar. 27, 2018)

See What happend to vertical scroll bar for Subscription list on YouTube?. YTScroll

Last 100 Bookmarks "Smart Folder" (Jan. 15, 2018)

See post no. 1199962#answer-1065184. Last 100 Bmks

Other Bookmarks "Smart Folder" for the Bookmarks Toolbar (June 4, 2019)

This versions shows only Other Bookmarks (most recent first) Other Bmks

Preface C:\ Links with file:/// (Jan. 14, 2018)

See post no. 1199682#answer-1065001. fileC

Enable Delete buttons on Bing Activity History (Dec. 10, 2017)

See post no. 1194084#answer-1048263. BingDelBtns

Show viewport dimensions while resizing (Dec. 9, 2017)

See post no. 1193846#answer-1047606. ViewportDims

Export Yahoo Bookmarks from My Yahoo page (Sept. 24, 2017)

See post no. 1176161#answer-1009768. Y!BmkExport

Contains FileSaver.js © 2016 Eli Grey (MIT License).

Apply/remove grayscale filter to page body (July 8, 2017)

See post no. 1167009#answer-984868. GrayTog

Popup Selected Text in a New Tab for Saving (November 23, 2016)

See post no. 1147512#answer-938460. PopSelection

Elevate video in front of obstruction(s) (October 23, 2016)

See post no. 1144152#answer-929429; only works after the ad stops. ElevateVid

Reposition video after ads (October 23, 2016)

See post no. 1144152#answer-929429; has the side effect of pausing the video. ReposVid

Outlook Live OWA "Email Link" Replacement (October 14, 2016)

See post no. 1143156#answer-926979. EmailLink-Outlook

Session Extractor (August 29, 2016)

See post no. 1136583#answer-911290. SessionExtract

Redactor Editor Source Text Wrap (July 31, 2016)

See post no. 1132838#answer-902126 (updated). SourceWrap

Outlook People Fixer (Aug. 16, 2015)

See post no. 1078311#answer-768450. OPeep

Escape from onbeforeunload (Dec. 29, 2013)

See post no. 981475#answer-516884. Escape

Highlight on Outlook.com (Oct. 28, 2013)

See post no. 975584?#answer-494784. To install, drag the desired "button" to your Bookmarks Toolbar:

Hilite-Y (yellow) Hilite-C (cyan) Hilite-G (green)

Hack Vine Video (Oct. 10, 2013)

See post no. 961627?page=2#answer-488527. VineVid

Turn on Spell Check (Oct. 2, 2013; updated Oct. 7, 2013)

Button for Basic Sites (form is not in a frame)

See post no. 971758#answer-485690. SpellYes

Test by clicking in this box, then clicking the button on your Bookmarks Toolbar:

Button for Rich Text Editors (form is in a frame)

See post no. 971758#answer-486709. SpellYes2

Test on this page: TinyMCE - Basic example.

Tumbler Controls (July 9, 2013)

See post no. 964515?page=1#answer-454942. TumBtns