I don't need it often, but when I do it's a life saver

Works so well! Also works for controlled forms (like the ones in React)

Even though this can work to fill a field (or retrieve all that text you just lost?), the interface is a mess of confusion and complication, even for engineers, and it cannot just simply fill a field as expected by clicking. I originally got this add-on because of losing hours of work, but functionality was so obfuscated this just kept happening to me anyway until I created saved documents for pasting to webpage fields. So if you need to fill multiple fields or forms EASILY, I think learn the Firefox built-in FormFill first.
Normally just simply clicking the toolbar button would fill the field or form or at least open dialog to basic functions like setting up your data such as a saved address. But no, that only opens a read-only window (no modify) showing a creepy amount of key-logging the add-on has done (like ALL of your recent texts or bank site entries unless you blacklist those). Then within that window you see the address you want filled (aha-the 2nd click?), but no that only frustratingly winks an icon on and off, or click fast enough and another read-only window displays the same untouchable data again..
So how to ACTUALLY fill in an address? First left-click on the field. Then right-click on the field to get context menu. Then scroll to the bottom to find the sub-menu. Then scroll down AGAIN past something called "herstel tekst veld" to pick one of two identically labelled "Fill Fields" items which should work if you have already typed your address earlier.
If you have time to earn a PHD, you could instead flip the manual for this thing and invest in a good flatclicker. You can discover all the scattered, secret, tiny interface elements that change usability depending on whether you left or right click. Like different places to access "Options" or "Preferences" (same thing/different names/different interface). There is a place to fix default key bindings (might type a weird symbol character or may not respond at all) you'll have to scroll the window since it's made too small. If you get access to the main dialog window, and not the small dialog window which is identical looking, (sometimes called "Manage History" sometimes called "Advanced Manage History") then you have a chance to search for what it was you wanted to click-and-fill and then you can right-click (not left-click which opens the grayed out read-only box) to get access to copying that info to the clipboard and then when you scroll to close the window (because the Close button is permanently below the window size) you can then paste that info into your form field. Oh wait, you can't do that because the whole window disappeared with the webpage and all the tabs when you clicked the Close box. Yeah. You made the mistake of having the Options/Preferences open in a tab in the same window as your webpage form. Good thing though, because closing that window revealed that you had 37 "Manage History" windows open behind it that somehow got opened in separate instances without getting closed. Now whether you dare click the Close button in the lower right or the Close button in the upper left for all those windows...you are on your own.

I am delighted to find this add-on fully functional again. I had become reliant upon it before changes to Firefox software rendered it inoperative.

Wonderful extension that has saved my butt many, many times over the years and I'm sure will do so for many more.

Very glad for this extension and also glad to have chipped in a few Euros from time to time. Thank you Stephan for the work you have put in for a real life saver, and please know it is appreciated.

Unclear when the save triggers for each field (on blur, on input/change?) and only seems to work with text inputs, not type="number" or select fields.

Seeehr hilfreich, spart viel Zeit, wenn ein längerer Text, bevor er abgeschickt wurde, warum auch immer plötzlich verschwindet. Funktioniert sogar auf Firefox für Android, auch wenn die Oberfläche dafür (noch?) nicht programmiert wurde und deshalb ein bisschen umständlich zu bedienen ist. Aber immer noch besser, als lange Texte gerade auf dem Handy neu zu tippen.

i want to give it 5/5 but it's not refreshing its a day behind. I mean every thing I do is in firefox history but no in the exension. Chrome has an extension called history trends unlimited so it tells me every single thing i do in order without overwrittening the timestamp.

not show history data

This module SAVED AGAIN MY WHOLE LIFE TODAY !!!

I was encountering two bugs simultaneously, one locally in Firefox, messing up displayed data (cache issues), and one in my hosting provider service, mixing up creation and modification dates ... so, I was not editing the file I thought (kind of wiki thing, online web page editor). So at the point I thought I had lost 1 to 2 months of INTENSE WORK, I visited this module, to check if by huge CHANCE it had saved any data recently ... and, the plugin pointed out that since 1 week I was editing the wrong file (with Firefox showing the wrong URL in the address bar), and then I could prove that my web server was showing creation dates in the modification column.

I was about to release my project sunday night.

Without this plugin, I would have lost 2 months of work (1 for preparing the project, 1 working on it), and because I am short of money, I would have been forced to abandon it ... at less than 60h from launch time.

Saved my life so many times that I am rather indulgent vis a vis the few malfunctions I sometimes encountered.

Does not work at all with Firefox ESR. Having used the browser for several months, by now Form History Control should be showing several dozen entries, but it comes up completely blank.

Works exactly as I need it to, good job! I used to use Lazarus on FF years ago, and have been using Typio on Chrome, now that I'm making the move back to FF, this is exactly what I needed.

This addon has saved so many long threads and e-mails. I'm so glad it exists and have recommended it to many people.

I imagine many computer screens have not been smashed because FHC saved entries when machines froze. lol.

Form history is epic and the only replacement for lazarus but it keeps on giving itself its FF shortcut commands back! Despite going into about:addons and deleting its currently active shortcuts, those shortcuts are restored after this extension is.. updated or saved somehow.

Why is it that whenever it's really needed, it's the time it doesn't work!...
It sees the YouTube comment as a retrievable/restorable field, why did it not save it when the video finishes and play the next in queue?... Ugh...
(I'm sure it restores as functional; just not when it's totally needed...)