## Launch Checklist
<!-- Thanks for the PR! Feel free to add or remove items from the
checklist. -->
- [x] Briefly describe the changes in this PR.
- [x] Link to related issues.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
- [ ] Write tests for all new functionality.
- [x] Add an entry to `CHANGELOG.md` under the `## main` section.
## Description
`showOpenFilePicker` and `showSaveFilePicker` are undefined on Firefox.
With this pr, Maputnik uses the old behavior as a fallback. It keeps the
naming "open" and "save" instead of "upload" and "download" to underline
that the style stays within the browser and no actual upload happens.
@zstadler Could you give it a try, please?
## Related Issue
- fixes https://github.com/maplibre/maputnik/issues/966
## Visual Changes
The "Save as" button gets hidden if `showSaveFilePicker` is not
available since it would have no use.
<table>
<tr>
<td>
Chrome
</td>
<td>
Firefox
</td>
</tr>
<tr>
<td>
<img
src="https://github.com/user-attachments/assets/cdc2cd4d-1c09-4dec-8c94-f8b0dd0c5b8e"
/>
</td>
<td>
<img
src="https://github.com/user-attachments/assets/0763ef63-6501-4cc1-977b-94753c3008ae"
/>
</td>
</tr>
</table>
## Launch Checklist
<!-- Thanks for the PR! Feel free to add or remove items from the
checklist. -->
- [x] Briefly describe the changes in this PR.
- [x] Link to related issues.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
- [ ] Write tests for all new functionality.
- [x] Add an entry to `CHANGELOG.md` under the `## main` section.
## Changes
- This pull request makes use of the FileSystemFileHandle API to modify
a local file. No need to download it - just click save.
- I don't know how to cover this functionality by tests so I need
directions in case test coverage is required.
- The pull request adds
[@types/wicg-file-system-access](https://www.npmjs.com/package/@types/wicg-file-system-access)
as a new dev dependency which I am not really pleased about but can't
think of a way around it.
## Known Limitations
- The used File API is only available in when accessed from https or on
localhost.
- There is no visual indicator that the file has been saved. Previously
the browser showed it as a new download.
## Issue
- https://github.com/maplibre/maputnik/issues/964
## Screenshots
### Menu
<img
src="https://github.com/user-attachments/assets/dfcfc5c2-0019-4857-ba26-224b5598fc11"
/>
### Open modal
<img
src="https://github.com/user-attachments/assets/4e1293e8-16b6-4b86-925b-3bebb49d8ca6"
height="200px" />
### Save modal
<img
src="https://github.com/user-attachments/assets/4f10e2c0-2dd3-4726-a613-30e0406619b0"
height="200px" />
---------
Co-authored-by: Harel M <harel.mazor@gmail.com>
Joscha Eckert
